[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/platform/bindings/V8PerContextData.cpp

Index: third_party/WebKit/Source/platform/bindings/V8PerContextData.cpp
diff --git a/third_party/WebKit/Source/platform/bindings/V8PerContextData.cpp b/third_party/WebKit/Source/platform/bindings/V8PerContextData.cpp
index 3a955b8e31d63f363a653ea904ff0d18adf9b5d8..2ef21508503cd85ffaefe95182e310b5840eced9 100644
--- a/third_party/WebKit/Source/platform/bindings/V8PerContextData.cpp
+++ b/third_party/WebKit/Source/platform/bindings/V8PerContextData.cpp
@@ -89,8 +89,10 @@ v8::Local<v8::Object> V8PerContextData::CreateWrapperFromCacheSlowCase(
     const WrapperTypeInfo* type) {
   DCHECK(!error_prototype_.IsEmpty());
 
-  v8::Context::Scope scope(GetContext());
+  v8::Local<v8::Context> context = GetContext();

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

|context| seems never used again?

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

Done.

+  v8::Context::Scope scope(context);
   v8::Local<v8::Function> interface_object = ConstructorForType(type);
+
   CHECK(!interface_object.IsEmpty());
   v8::Local<v8::Object> instance_template =
       V8ObjectConstructor::NewInstance(isolate_, interface_object)
@@ -159,7 +161,6 @@ v8::Local<v8::Function> V8PerContextData::ConstructorForTypeSlowCase(
   // Origin Trials
   InstallConditionalFeatures(type, ScriptState::From(current_context),
                              prototype_object, interface_object);
-
   constructor_map_.Set(type, interface_object);
 
   return interface_object;