[build] Port using prebuilt instrumented libraries for msan

BUG=chromium:631979
NOTRY=true

Review-Url: https://codereview.chromium.org/2189343002
Cr-Commit-Position: refs/heads/master@{#38197}

DEPS

@@ -215,6 +215,16 @@ hooks = [
         '--running-as-hook',
     ],
   },
+  {
+    # Pull sanitizer-instrumented third-party libraries if requested via
+    # GYP_DEFINES.
+    'name': 'instrumented_libraries',
+    'pattern': '\\.sha1',
+    'action': [
+        'python',
+        'v8/third_party/instrumented_libraries/scripts/download_binaries.py',
+    ],
+  },
   {
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',

gypfiles/standalone.gypi

@@ -121,12 +121,19 @@
       # also controls coverage granularity (1 for function-level, 2 for
       # block-level, 3 for edge-level).
       'sanitizer_coverage%': 0,
+
+      # Use dynamic libraries instrumented by one of the sanitizers
+      # instead of the standard system libraries. Set this flag to download
+      # prebuilt binaries from GCS.
+      'use_prebuilt_instrumented_libraries%': 0,
+
       # Use libc++ (buildtools/third_party/libc++ and
       # buildtools/third_party/libc++abi) instead of stdlibc++ as standard
       # library. This is intended to be used for instrumented builds.
       'use_custom_libcxx%': 0,
 
       'clang_dir%': '<(base_dir)/third_party/llvm-build/Release+Asserts',
+      'make_clang_dir%': '<(base_dir)/third_party/llvm-build/Release+Asserts',
 
       'use_lto%': 0,
 
@@ -178,6 +185,7 @@
     },
     'base_dir%': '<(base_dir)',
     'clang_dir%': '<(clang_dir)',
+    'make_clang_dir%': '<(make_clang_dir)',
     'host_arch%': '<(host_arch)',
     'host_clang%': '<(host_clang)',
     'target_arch%': '<(target_arch)',
@@ -190,6 +198,7 @@
     'msan%': '<(msan)',
     'tsan%': '<(tsan)',
     'sanitizer_coverage%': '<(sanitizer_coverage)',
+    'use_prebuilt_instrumented_libraries%': '<(use_prebuilt_instrumented_libraries)',
     'use_custom_libcxx%': '<(use_custom_libcxx)',
     'linux_use_bundled_gold%': '<(linux_use_bundled_gold)',
     'use_lto%': '<(use_lto)',
@@ -654,6 +663,11 @@
               }],
             ],
           }],
+          ['use_prebuilt_instrumented_libraries==1', {
+            'dependencies': [
+              '<(DEPTH)/third_party/instrumented_libraries/instrumented_libraries.gyp:prebuilt_instrumented_libraries',
+            ],
+          }],
           ['use_custom_libcxx==1', {
             'dependencies': [
               '<(DEPTH)/buildtools/third_party/libc++/libc++.gyp:libcxx_proxy',

infra/mb/mb_config.pyl

@@ -498,8 +498,10 @@
     },
 
     'msan': {
-      'gn_args': 'is_msan=true',
-      'gyp_defines': 'clang=1 msan=1',
+      'gn_args': ('is_msan=true msan_track_origins=2 '
+                  'use_prebuilt_instrumented_libraries=true'),
+      'gyp_defines': ('clang=1 msan=1 msan_track_origins=2 '
+                      'use_prebuilt_instrumented_libraries=1'),
     },
 
     'release': {