[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp

Index: third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
index d2709fe37ec439602166a57e6f6568ace7b8699c..f19f70304812a29daf3d89af05c838d828f14655 100644
--- a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
@@ -9,6 +9,7 @@
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8IdleTaskRunner.h"
 #include "bindings/core/v8/V8Initializer.h"
+#include "bindings/core/v8/V8SnapshotCreator.h"
 #include "core/inspector/WorkerThreadDebugger.h"
 #include "platform/CrossThreadFunctional.h"
 #include "platform/RuntimeEnabledFeatures.h"
@@ -60,8 +61,11 @@ WorkerBackingThread::~WorkerBackingThread() {}
 void WorkerBackingThread::Initialize() {
   DCHECK(!isolate_);
   backing_thread_->Initialize();
+  // TODO(peria): Replace GetReferenceTable with nullptr.

[Yuki, 2017/05/30 14:35:57]

Could you elaborate why we'd like to replace it?
Or why we cannot replace it at this moment?

[peria, 2017/06/01 08:33:33]

Due to V8 issue.
http://crbug.com/v8/6448

   isolate_ = V8PerIsolateData::Initialize(
-      backing_thread_->PlatformThread().GetWebTaskRunner());
+      backing_thread_->PlatformThread().GetWebTaskRunner(),
+      V8SnapshotCreator::GetReferenceTable(),
+      V8PerIsolateData::V8ContextMode::kDontUseSnapshot);
   AddWorkerIsolate(isolate_);
   V8Initializer::InitializeWorker(isolate_);