Make OffscreenCanvas Transferable

third_party/WebKit/Source/bindings/modules/v8/ScriptValueSerializerForModules.h

Index: third_party/WebKit/Source/bindings/modules/v8/ScriptValueSerializerForModules.h
diff --git a/third_party/WebKit/Source/bindings/modules/v8/ScriptValueSerializerForModules.h b/third_party/WebKit/Source/bindings/modules/v8/ScriptValueSerializerForModules.h
index 23828f54cae9a603930df309d55fa19ed2712cc1..98eb06733bdd96953f96d950e5df1f2a9a583c09 100644
--- a/third_party/WebKit/Source/bindings/modules/v8/ScriptValueSerializerForModules.h
+++ b/third_party/WebKit/Source/bindings/modules/v8/ScriptValueSerializerForModules.h
@@ -23,6 +23,7 @@ public:
     }
 
     void writeDOMFileSystem(int type, const String& name, const String& url);
+    void writeTransferredOffscreenCanvas(uint32_t index, uint32_t width, uint32_t height, uint32_t id);
     bool writeCryptoKey(const WebCryptoKey&);
 
 private:
@@ -76,7 +77,11 @@ private:
     ScriptValueSerializer::StateBase* doSerializeValue(v8::Local<v8::Value>, ScriptValueSerializer::StateBase* next) override;
 
     ScriptValueSerializer::StateBase* writeDOMFileSystem(v8::Local<v8::Value>, ScriptValueSerializer::StateBase* next);
+    ScriptValueSerializer::StateBase* writeTransferredOffscreenCanvas(v8::Local<v8::Value>, uint32_t index, ScriptValueSerializer::StateBase* next);
     bool writeCryptoKey(v8::Local<v8::Value>);
+    typedef V8ObjectMap<v8::Object, uint32_t> ObjectPool;
+    ObjectPool m_transferredOffscreenCanvas;
+    SerializedScriptValueWriter& m_writer;
 };
 
 class ScriptValueDeserializerForModules final : public ScriptValueDeserializer {
@@ -84,9 +89,12 @@ class ScriptValueDeserializerForModules final : public ScriptValueDeserializer {
     WTF_MAKE_NONCOPYABLE(ScriptValueDeserializerForModules);
 public:
     ScriptValueDeserializerForModules(SerializedScriptValueReaderForModules&, MessagePortArray* messagePorts, ArrayBufferContentsArray*, ImageBitmapContentsArray*);
+    bool tryGetTransferredOffscreenCanvas(uint32_t index, uint32_t width, uint32_t height, uint32_t id, v8::Local<v8::Value>*) override;
 
 private:
     bool read(v8::Local<v8::Value>*) override;
+    Vector<v8::Local<v8::Value>> m_offscreenCanvases;
+    SerializedScriptValueReader& m_reader;
 };
 
 } // namespace blink