Set V8 extras mode in gin::V8Initializer.

gin/v8_initializer.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gin/v8_initializer.h"
 
 #include "base/basictypes.h"
 #include "base/debug/alias.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
@@ skipping 344 matching lines @@
 // static
 base::PlatformFile V8Initializer::GetOpenSnapshotFileForChildProcesses(
     base::MemoryMappedFile::Region* region_out) {
   OpenSnapshotFileIfNecessary();
   *region_out = g_snapshot_region;
   return g_snapshot_pf;
 }
 #endif  // defined(V8_USE_EXTERNAL_STARTUP_DATA)
 
 // static
-void V8Initializer::Initialize(gin::IsolateHolder::ScriptMode mode) {
+void V8Initializer::Initialize(IsolateHolder::ScriptMode mode,
+                               IsolateHolder::V8ExtrasMode v8_extras_mode) {
   static bool v8_is_initialized = false;
   if (v8_is_initialized)
     return;
 
   v8::V8::InitializePlatform(V8Platform::Get());
 
-  if (gin::IsolateHolder::kStrictMode == mode) {
+  if (IsolateHolder::kStrictMode == mode) {
     static const char use_strict[] = "--use_strict";
     v8::V8::SetFlagsFromString(use_strict, sizeof(use_strict) - 1);
   }
+  if (IsolateHolder::kStableAndExperimentalV8Extras == v8_extras_mode) {
+    static const char flag[] = "--experimental_extras";
+    v8::V8::SetFlagsFromString(flag, sizeof(flag) - 1);
+  }
 
 #if defined(V8_USE_EXTERNAL_STARTUP_DATA)
   v8::StartupData natives;
   natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
   natives.raw_size = static_cast<int>(g_mapped_natives->length());
   v8::V8::SetNativesDataBlob(&natives);
 
   if (g_mapped_snapshot != NULL) {
     v8::StartupData snapshot;
     snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
@@ skipping 24 matching lines @@
     *snapshot_data_out =
         reinterpret_cast<const char*>(g_mapped_snapshot->data());
     *snapshot_size_out = static_cast<int>(g_mapped_snapshot->length());
   } else {
     *snapshot_data_out = NULL;
     *snapshot_size_out = 0;
   }
 }
 
 }  // namespace gin