Removes from CL https://codereview.chromium.org/2929853003 code to fix
histogram timers in class WasmCompilationUnit. This was done because
the CL was reverted due to errors caused by background compiles that
updated UMA histogram timers.

The goal of this CL is to reland the remaining portion of the reverted
CL.

Bug:v8:6361

Change-Id: Ic03ceb118734bd55c463a843521bcd5b09342afe
Reviewed-on: https://chromium-review.googlesource.com/550196Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
Commit-Queue: Karl Schimpf <kschimpf@google.com>
Cr-Commit-Position: refs/heads/master@{#46268}

BUG=chromium:694255

Change-Id: I3e9c5e6b47b4dd0fbd2524b3329dbef14d4ad4e7
Reviewed-on: https://chromium-review.googlesource.com/550158Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46267}

This is a step towards removing the dependency on CEntryStub. The next
step will reuse BuildCCall to that end. BuildCCall is a member of
WasmGraphBuilder.

Bug: 
Change-Id: I35d3af31b15c04af3d1b877049fd9eccaef306b5
Reviewed-on: https://chromium-review.googlesource.com/549106
Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46266}

Bug: v8:6524
Change-Id: I8e440417eea59376c2fab659a86ad6570c7e018a
Reviewed-on: https://chromium-review.googlesource.com/549300Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46265}

NOTRY=true
TBR=whesse@chromium.org

Bug: chromium:645890
Change-Id: I134d8c09792824589430856a1d9b43e0464c4542
Reviewed-on: https://chromium-review.googlesource.com/550159Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46264}

R=clemensh@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2959963002
Cr-Commit-Position: refs/heads/master@{#46263}

This is a reland of 72b88fda
Original change's description:
> [runtime] Make all built-in functions strict.
> 
> According to ES#sec-built-in-function-objects all built-in functions
> must be strict.
> 
> This is a preliminary CL before changing the way we define built-in
> functions in native JS files.
> 
> Bug: v8:6529, v8:6459
> Change-Id: I8e60b342f04ea1b0843fe1990334cbb9b26ebac4
> Reviewed-on: https://chromium-review.googlesource.com/546215
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Adam Klein <adamk@chromium.org>
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46237}

Bug: v8:6529, v8:6459
Change-Id: Ic0eb3d7925ed63dd716c4a114601415f92627ca5
Reviewed-on: https://chromium-review.googlesource.com/550156Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46262}

This reverts commit 189c8263.

Reason for revert: Lots of layout test changes:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/16607

Original change's description:
> Enable StringConcat bytecode.
> 
> BUG=v8:6243
> 
> Change-Id: Idb9aa8221248cc493c8f5ba4bd50fa712a57f5f8
> Reviewed-on: https://chromium-review.googlesource.com/541221
> Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46249}

TBR=rmcilroy@chromium.org,jgruber@chromium.org,leszeks@chromium.org

Change-Id: I3ce96264d8c0e183b02c0344b90275e207683f7a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6243
Reviewed-on: https://chromium-review.googlesource.com/550157Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46261}

Add support for I32x4SConvertI16x8Low, I32x4SConvertI16x8High,
I32x4UConvertI16x8Low, I32x4UConvertI16x8High, I16x8SConvertI8x16Low,
I16x8SConvertI8x16High,I16x8SConvertI32x4, I16x8UConvertI32x4,
I16x8UConvertI8x16Low, I16x8UConvertI8x16High, I8x16SConvertI16x8,
I8x16UConvertI16x8 operations for mips32 and mips64 architectures.

Bug: 
Change-Id: I32f24956fc8e3c7df7f525bf0d4518161493a3ed
Reviewed-on: https://chromium-review.googlesource.com/517500
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Miran Karić <Miran.Karic@imgtec.com>
Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Cr-Commit-Position: refs/heads/master@{#46260}

- Restructure the methods that are not allowed to fail to avoid a branch.
- Undo compaction changes for the reland as they require further investigation

This reverts commit 7dea0f7b.

Bug: chromium:651354
Change-Id: I93e8601bcdec534f41f8e27fd83848f8ef0f1244
Reviewed-on: https://chromium-review.googlesource.com/549462
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46259}

This'll make the workflow more flexible as in GN world, the builddir
is often not in the currently hardcoded out/Release.

NOTRY=true

Bug: chromium:645890
Change-Id: Id2afc8d8fea322ac98b65b7e9d28a2ba8c0dd0ac
Reviewed-on: https://chromium-review.googlesource.com/549899
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46258}

NOTRY=true

Bug: chromium:645890
Change-Id: I40dd42c693aab1c4f8a790e497165f37fe53dcdd
Reviewed-on: https://chromium-review.googlesource.com/548637
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46257}

R=mvstanton@chromium.org

Change-Id: Ic8276eb6c282032a81d40c47409ead31d11565b7
Reviewed-on: https://chromium-review.googlesource.com/549302Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46256}

This makes reopening the handle easier, and also reduces the size of
the handle space.

Drive-by change: Make all fields of the ModuleCompiler private.

R=clemensh@chromium.org

Change-Id: I2f9553a00012b9ce7743bf68bdf1c3095ca69fe0
Reviewed-on: https://chromium-review.googlesource.com/548397
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46255}

This adds GN configs for using sanitizer coverage and refactors gcov
configs. Now, both coverage kinds are behind the same gn argument
v8_code_coverage.

This also switches the bot to GN.

Bug: chromium:645890,v8:5502
Change-Id: I3af606e0cad109dd790a121d0d92e53cf4e38f9a
Reviewed-on: https://chromium-review.googlesource.com/549360Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46254}

Forward the concrete class used in CRTP to avoid having virtual class to
the outmost declaration.

Bug: chromium:736641
Change-Id: I8ab693b8f75507318a892c1994d9c899ba5a41d1
Reviewed-on: https://chromium-review.googlesource.com/549303
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46253}

For handling restartability issues, following conditions must be
fulfilled:
- For Branch-and-link restartability: GPR 31 (ra register) must not be
used for the source register rs.
- For Jump-and-Link restartability: Register specifiers rs and rd must
not be equal.
This CL implements checking that GPR 31 is not used as source register.

TEST=
BUG=

Change-Id: I568ff9c497b4efca73f1a5353cb7520202524479
Reviewed-on: https://chromium-review.googlesource.com/549362Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Cr-Commit-Position: refs/heads/master@{#46252}

BUG=chromium:694255

Change-Id: Ib954eaf868862577fb567a1438ca1c9136821eb4
Reviewed-on: https://chromium-review.googlesource.com/549417Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46251}

Bug: 
Change-Id: I56bfd921d63783ddaa74133dde5f3daf776e68ca
Reviewed-on: https://chromium-review.googlesource.com/548115
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46250}

BUG=v8:6243

Change-Id: Idb9aa8221248cc493c8f5ba4bd50fa712a57f5f8
Reviewed-on: https://chromium-review.googlesource.com/541221
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46249}

This broke after https://codereview.chromium.org/2860653002

NOTRY=true
TBR=ochang@chromium.org,jarin@chromium.org

Bug: v8:5502
Change-Id: I062f6601da0b8249d7749275fc415a72e42d0e40
Reviewed-on: https://chromium-review.googlesource.com/549931
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46248}

This reverts commit 3c04ee6d.

Reason for revert: Speculative revert for OOMs in:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20shared/builds/18563

Original change's description:
> [heap] Make aborting compaction a fatal
> 
> Last attempt failed because of too agressive growing and no proper GC
> scheduling.
> 
> Also refactor live object iteration on the way to avoid a branch when we
> know that we will succeed.
> 
> Bug: chromium:651354
> Change-Id: I8f52cbc79ac293989fb7c29c492d4ae4afe5ebe4
> Reviewed-on: https://chromium-review.googlesource.com/544829
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46245}

TBR=ulan@chromium.org,mlippautz@chromium.org

Change-Id: Ifb9fd0c873c4ec6d4bd895f2978849cc2a223a05
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:651354
Reviewed-on: https://chromium-review.googlesource.com/549324Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46247}

Adds new APIs Isolate::GetIncumbentContext() and
Context::BackupIncumbentScope to support
"the backup incumbent settings object stack" [1].

[1] https://html.spec.whatwg.org/multipage/webappapis.html#backup-incumbent-settings-object-stack

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I1ccea0e6fe2743fe5f3072b9e1236111ce2b1a42
Reviewed-on: https://chromium-review.googlesource.com/536728Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46246}

Last attempt failed because of too agressive growing and no proper GC
scheduling.

Also refactor live object iteration on the way to avoid a branch when we
know that we will succeed.

Bug: chromium:651354
Change-Id: I8f52cbc79ac293989fb7c29c492d4ae4afe5ebe4
Reviewed-on: https://chromium-review.googlesource.com/544829
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46245}

Change-Id: Id922e799deb0360680b819493fc27b4f6dd436e3
Reviewed-on: https://chromium-review.googlesource.com/544082Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46244}

Adds a CheckString to all operand inputs of JSStringConcat. The operands are
already known to be strings, so this will get eliminated in almost all cases,
however, if there is a yield within the concatenation then we lose the
knowledge that the previous operands are strings since the values are loaded
from the generator object. Adds a test for this case.

BUG=v8:6243

Change-Id: I1601a316e6efbed1c53486f1027cb0ea023ff030
Reviewed-on: https://chromium-review.googlesource.com/549301
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46243}

This reverts commit 72b88fda.

Reason for revert: Changes a layout test:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/16595

Original change's description:
> [runtime] Make all built-in functions strict.
> 
> According to ES#sec-built-in-function-objects all built-in functions
> must be strict.
> 
> This is a preliminary CL before changing the way we define built-in
> functions in native JS files.
> 
> Bug: v8:6459
> Change-Id: I8e60b342f04ea1b0843fe1990334cbb9b26ebac4
> Reviewed-on: https://chromium-review.googlesource.com/546215
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Adam Klein <adamk@chromium.org>
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46237}

TBR=adamk@chromium.org,ishell@chromium.org,verwaest@chromium.org

Change-Id: Ic458b478b2dd23aae7ea2a51aa6052c1f5931c56
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6459
Reviewed-on: https://chromium-review.googlesource.com/549322Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46242}

Bug: chromium:736758
Change-Id: If49fda42618c27be1472a98399e440ad26b7f199
Reviewed-on: https://chromium-review.googlesource.com/548401
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46241}

CL https://chromium-review.googlesource.com/c/523271/6 introduced a
wrong lookup of ArrayBuffer::Allocator::Allocator::AllocationMode that
breaks compilation with Visual Studio 2013.

R=jochen@chromium.org

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I160242bc24ef8c23574d3ec3734be822a681b408
Reviewed-on: https://chromium-review.googlesource.com/548399Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46240}

Change-Id: Ie380c38a91a05b66fd25172eebbb28b4cfeb646b
Reviewed-on: https://chromium-review.googlesource.com/543926Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46239}

Change-Id: Ib94db9145d668d4c565e80f8a25524ad2a44928e
Reviewed-on: https://chromium-review.googlesource.com/544101Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46238}

According to ES#sec-built-in-function-objects all built-in functions
must be strict.

This is a preliminary CL before changing the way we define built-in
functions in native JS files.

Bug: v8:6459
Change-Id: I8e60b342f04ea1b0843fe1990334cbb9b26ebac4
Reviewed-on: https://chromium-review.googlesource.com/546215Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46237}

This reverts commit 2ec46bec.

Reason for revert:
avx2 builders have moved to the chromium swarming pool

Original change's description:
> [CQ] Temporarily make avx2 trybot experimental.
> 
> NOTRY=true
> NOPRESUBMIT=true
> TBR=tandrii@chromium.org
> 
> Bug: chromium:736757
> Change-Id: I920eda5c916981d3588fb7346ec4e811dc5112aa
> Reviewed-on: https://chromium-review.googlesource.com/548360
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46219}

TBR=machenbach@chromium.org,tandrii@chromium.org,clemensh@chromium.org

Change-Id: If228a34be2e6e88dbd2cc3fc1de0b227c4d113c2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:736757
Reviewed-on: https://chromium-review.googlesource.com/549321Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46236}

This reverts commit 87f71769.

Reason for revert: Performance regressions https://chromeperf.appspot.com/group_report?rev=46185

Original change's description:
> [ignition] Merge bytecode array builder and writer
> 
> Move bytecode array writing logic into the array builder, allowing us to
> remove the bytecode array writer and bytecode node, and convert runtime
> operand writing to compile-time bytecode operand writing using the
> information statically known at compile time.
> 
> Bug: v8:6474
> Change-Id: I210cd9897fd41293745614e4a253c7c251dfffc9
> Reviewed-on: https://chromium-review.googlesource.com/533055
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46183}

TBR=rmcilroy@chromium.org,leszeks@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:6474
Bug: chromium:736646
Change-Id: I00287b2bbbb8efa5a3141bc9c2906f91a7d33e51
Reviewed-on: https://chromium-review.googlesource.com/549319Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46235}

Bug: chromium:736641
Change-Id: I93e8c0bbdcc471750073d39b10b18c18ceee7d8a
Reviewed-on: https://chromium-review.googlesource.com/549416Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46234}

R=clemensh@chromium.org

Change-Id: I74da1171f157f2c8040d2296019f4fb44b329910
Reviewed-on: https://chromium-review.googlesource.com/549356Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46233}

The Construct bytecode is always passed a valid feedback slot (just like
the Call bytecode), so no need to check for invalid feedback slot anymore.
Also perform the call count increment initially for both bytecodes instead
of delaying it, which decreases live range for the feedback vector and slot
registers.

R=mythria@chromium.org, rmcilroy@chromium.org
BUG=v8:4280

Review-Url: https://codereview.chromium.org/2955063002
Cr-Commit-Position: refs/heads/master@{#46232}

Uninitialized property accesses are replaced with SOFT deopts in
TurboFan, but uninitialized JSCall nodes are not, and instead they
just stick around and are also not being inlined because the heurstic
in TurboFan doesn't consider those candidates since their call frequency
is below the threshold. This unifies the behavior and also replaces
uninitialized calls with SOFT deopts, addressing some inconsistency in
optimization behavior as discovered by Brian White of Node for example
here: https://twitter.com/mscdexdotexe/status/879005026202640385

R=jarin@chromium.org
BUG=v8:4551, v8:5267

Review-Url: https://codereview.chromium.org/2956843002
Cr-Commit-Position: refs/heads/master@{#46231}

Rolling v8/base/trace_event/common: https://chromium.googlesource.com/chromium/src/base/trace_event/common/+log/39a3450..65d1d42

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/564be75..41581c8

Rolling v8/third_party/catapult: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+log/d4f2d77..520dd37

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Change-Id: I1857e9fa631d41fdfd6bb387e2633497dc9e44f8
Reviewed-on: https://chromium-review.googlesource.com/549198Reviewed-by: v8 autoroll <v8-autoroll@chromium.org>
Commit-Queue: v8 autoroll <v8-autoroll@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46230}

This is towards closing the perf gap between the MSVC build (which uses link-
time optimization) and Clang (where LTO isn't ready on Windows yet). We did
a study (see bug) to see which non-inlined functions are hit a lot during render
start-up, and which would be inlined during LTO. This should benefit performance
in all builds which currently don't use LTO (Android, Linux, Mac) as well as
the Win/Clang build.

The binary size of chrome_child.dll increases by 2KB with this.

BUG=chromium:728324
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_chromium_compile_dbg_ng;master.tryserver.chromium.mac:mac_chromium_compile_dbg_ng

Review-Url: https://codereview.chromium.org/2950993002
Cr-Commit-Position: refs/heads/master@{#46229}