This adds a reduced version of bot_default with only d8-based test suites.
Those can be used for gc stress testing, fuzzing and predictable mode.

This also adds a missing explicit build rule for the debugger test suite.
It's working as it's part of the isolate file, but incremental
re-isolation might break on code changes.

Running the tests is still commented out to allow the infra-side to
land. Afterwards, we'll activate the extra testing as a V8 CL
commenting the lines back in.

Bug: v8:7285
Change-Id: I7b758c212f0c4ae3d2f79beea5ec597cee479565
Reviewed-on: https://chromium-review.googlesource.com/864045Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50545}

This introduces:
- a way in d8 to send messages to the inspector and receive responses.
- a new test suite where existing debugger tests should migrate to.

R=jgruber@chromium.org, kozyatinskiy@chromium.org, machenbach@chromium.org
BUG=v8:5530

Review-Url: https://chromiumcodereview.appspot.com/2425973002
Cr-Commit-Position: refs/heads/master@{#40487}

BUG=chromium:635948

Review-Url: https://codereview.chromium.org/2393863002
Cr-Commit-Position: refs/heads/master@{#40194}

BUG=chromium:535160
LOG=n
TBR=tandrii@chromium.org

Review URL: https://codereview.chromium.org/1607503002

Cr-Commit-Position: refs/heads/master@{#33391}

BUG=chromium:535160
LOG=n

Review URL: https://codereview.chromium.org/1402953004

Cr-Commit-Position: refs/heads/master@{#31267}

This adds the unittests to the "default" test set. Now that
the "default" and the DEFAULT_TESTS (i.e. runner with
no arguments) are the same, removed DEFAULT_TESTS and use
TEST_MAP["default"] instead.

On the bots, where unittests and default were run in
separation before, the explicit unittests step should now
be skipped.

This is necessary for swarming, as the unittests step is
too small to justify its own swarming job.

BUG=chromium:535160
LOG=n

Review URL: https://codereview.chromium.org/1374733006

Cr-Commit-Position: refs/heads/master@{#31122}

This reverts commit 280a6f8e.

Reland of https://codereview.chromium.org/1380593002/

BUG=chromium:535160
LOG=n
CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_nosnap_rel;

Review URL: https://codereview.chromium.org/1390473003

Cr-Commit-Position: refs/heads/master@{#31094}

BUG=chromium:535160
LOG=n

Review URL: https://codereview.chromium.org/1361953003

Cr-Commit-Position: refs/heads/master@{#30943}