[Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/platform/bindings/ScriptWrappable.h

 /*
  * Copyright (C) 2010 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 137 matching lines @@
   }
 
   bool ContainsWrapper() const { return !main_world_wrapper_.IsEmpty(); }
 
   //  Mark wrapper of this ScriptWrappable as alive in V8. Only marks
   //  wrapper in the main world. To mark wrappers in all worlds call
   //  ScriptWrappableVisitor::markWrapper(ScriptWrappable*, v8::Isolate*)
   void MarkWrapper(const WrapperVisitor*) const;
 
  private:
-  // These classes are exceptionally allowed to use mainWorldWrapper().
+  // These classes are exceptionally allowed to use MainWorldWrapper().
   friend class DOMDataStore;
   friend class HeapSnaphotWrapperVisitor;
   friend class V8HiddenValue;
   friend class V8PrivateProperty;
+  friend class V8SnapshotUtil;

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

Add TODO(peria): Remove V8SnapshotUtil from a list of friend classes.

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

Done.

 
   v8::Local<v8::Object> MainWorldWrapper(v8::Isolate* isolate) const {
     return v8::Local<v8::Object>::New(isolate, main_world_wrapper_);
   }
 
   // Only use when really necessary, i.e., when passing over this
   // ScriptWrappable's reference to V8. Should only be needed by GC
   // infrastructure.
   const v8::Persistent<v8::Object>* RawMainWorldWrapper() const {
     return &main_world_wrapper_;
@@ skipping 31 matching lines @@
 #define DECLARE_WRAPPERTYPEINFO()                             \
  public:                                                      \
   const WrapperTypeInfo* GetWrapperTypeInfo() const override; \
                                                               \
  private:                                                     \
   typedef void end_of_define_wrappertypeinfo_not_reached_t
 
 }  // namespace blink
 
 #endif  // ScriptWrappable_h