[Bindings] Create and use V8 context snapshots

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

 /*
  * Copyright (C) 2009 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 54 matching lines @@
     kUnspecifiedWorldIdStart,
   };
 
   enum class WorldType {
     kMain,
     kIsolated,
     kInspectorIsolated,
     kGarbageCollector,
     kRegExp,
     kTesting,
+    kForV8ContextSnapshotNonMain,
     kWorker,
   };
 
   // Creates a world other than IsolatedWorld. Note this can return nullptr if
   // GenerateWorldIdForType fails to allocate a valid id.
   static PassRefPtr<DOMWrapperWorld> Create(v8::Isolate*, WorldType);
 
   // Ensures an IsolatedWorld for |worldId|.
   static PassRefPtr<DOMWrapperWorld> EnsureIsolatedWorld(v8::Isolate*,
                                                          int world_id);
@@ skipping 137 matching lines @@
 
   const WorldType world_type_;
   const int world_id_;
   std::unique_ptr<DOMDataStore> dom_data_store_;
   HashSet<std::unique_ptr<DOMObjectHolderBase>> dom_object_holders_;
 };
 
 }  // namespace blink
 
 #endif  // DOMWrapperWorld_h