[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp b/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
index 49e0f585a19e248eab694781569c82fcd660ff48..8cd5a6cc3282ebde92267efb98d530865669af5e 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
@@ -40,6 +40,7 @@
 #include "bindings/core/v8/V8ErrorHandler.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8IdleTaskRunner.h"
+#include "bindings/core/v8/V8SnapshotUtil.h"
 #include "bindings/core/v8/WorkerOrWorkletScriptController.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
@@ -380,6 +381,9 @@ static void InitializeV8Common(v8::Isolate* isolate) {
   isolate->SetUseCounterCallback(&UseCounterCallback);
   isolate->SetWasmModuleCallback(WasmModuleOverride);
   isolate->SetWasmInstanceCallback(WasmInstanceOverride);
+
+  v8::HandleScope handle_scope(isolate);
+  V8SnapshotUtil::EnsureInterfaceTemplates(isolate);
 }
 
 namespace {
@@ -434,14 +438,21 @@ void V8Initializer::InitializeMainThread() {
                                  v8_extras_mode, &array_buffer_allocator);
 
   // NOTE: Some threads (namely utility threads) don't have a scheduler.
-  WebScheduler* scheduler = Platform::Current()->CurrentThread()->Scheduler();
+  Platform* platform = Platform::Current();
+  WebThread* thread = platform->CurrentThread();
+  WebScheduler* scheduler = thread ? thread->Scheduler() : nullptr;

[Yuki, 2017/06/20 14:20:11]

Why |thread| can be null?

[peria, 2017/06/21 07:19:16]

In taking snapshot process, we have no implementation for
Platform::CurrentThread(), and it returns nullptr.

+
   // When timer task runner is used for PerIsolateData, GC tasks are getting
   // throttled and memory usage goes up. For now we're using loading task queue
   // to prevent this.
   // TODO(altimin): Consider switching to timerTaskRunner here.
   v8::Isolate* isolate = V8PerIsolateData::Initialize(
       scheduler ? scheduler->LoadingTaskRunner()
-                : Platform::Current()->CurrentThread()->GetWebTaskRunner());
+                : thread ? thread->GetWebTaskRunner() : nullptr,
+      V8SnapshotUtil::GetReferenceTable(),
+      platform->IsToTakeV8Snapshot()
+          ? V8PerIsolateData::V8ContextMode::kTakeSnapshot
+          : V8PerIsolateData::V8ContextMode::kUseSnapshot);
 
   InitializeV8Common(isolate);