[Bindings] Create and use V8 context snapshots

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

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 118 matching lines @@
           kV8PrototypeTypeIndex, const_cast<WrapperTypeInfo*>(type));
     }
     type->PreparePrototypeAndInterfaceObject(current_context, world,
                                              prototype_object, interface_object,
                                              interface_template);
   }
 
   // Origin Trials
   InstallConditionalFeatures(type, ScriptState::From(current_context),
                              prototype_object, interface_object);
-
   constructor_map_.Set(type, interface_object);
-
   return interface_object;
 }
 
 v8::Local<v8::Object> V8PerContextData::PrototypeForType(
     const WrapperTypeInfo* type) {
   v8::Local<v8::Object> constructor = ConstructorForType(type);
   if (constructor.IsEmpty())
     return v8::Local<v8::Object>();
   v8::Local<v8::Value> prototype_value;
   if (!constructor->Get(GetContext(), V8String(isolate_, "prototype"))
@@ skipping 28 matching lines @@
 
 void V8PerContextData::ClearData(const char* key) {
   data_map_.erase(key);
 }
 
 V8PerContextData::Data* V8PerContextData::GetData(const char* key) {
   return data_map_.at(key);
 }
 
 }  // namespace blink