| Index: third_party/WebKit/Source/bindings/core/v8/ScriptValueSerializer.h | 
| diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptValueSerializer.h b/third_party/WebKit/Source/bindings/core/v8/ScriptValueSerializer.h | 
| index 3540474ba0edb830e3f4df7760b44824930554e4..b3115076ca8186e397a9eca4cc3648ba58992a8d 100644 | 
| --- a/third_party/WebKit/Source/bindings/core/v8/ScriptValueSerializer.h | 
| +++ b/third_party/WebKit/Source/bindings/core/v8/ScriptValueSerializer.h | 
| @@ -143,6 +143,7 @@ public: | 
| void writeTransferredMessagePort(uint32_t index); | 
| void writeTransferredArrayBuffer(uint32_t index); | 
| void writeTransferredImageBitmap(uint32_t index); | 
| +    void writeTransferredOffscreenCanvas(uint32_t index, uint32_t width, uint32_t height, uint32_t id); | 
| void writeTransferredSharedArrayBuffer(uint32_t index); | 
| void writeObjectReference(uint32_t reference); | 
| void writeObject(uint32_t numProperties); | 
| @@ -409,6 +410,7 @@ private: | 
| StateBase* writeArrayBuffer(v8::Local<v8::Value>, StateBase* next); | 
| StateBase* writeTransferredArrayBuffer(v8::Local<v8::Value>, uint32_t index, StateBase* next); | 
| StateBase* writeTransferredImageBitmap(v8::Local<v8::Value>, uint32_t index, StateBase* next); | 
| +    StateBase* writeTransferredOffscreenCanvas(v8::Local<v8::Value>, uint32_t index, StateBase* next); | 
| StateBase* writeTransferredSharedArrayBuffer(v8::Local<v8::Value>, uint32_t index, StateBase* next); | 
| static bool shouldSerializeDensely(uint32_t length, uint32_t propertyCount); | 
|  | 
| @@ -445,6 +447,7 @@ private: | 
| ObjectPool m_transferredMessagePorts; | 
| ObjectPool m_transferredArrayBuffers; | 
| ObjectPool m_transferredImageBitmaps; | 
| +    ObjectPool m_transferredOffscreenCanvas; | 
| uint32_t m_nextObjectReference; | 
| WebBlobInfoArray* m_blobInfo; | 
| BlobDataHandleMap& m_blobDataHandles; | 
| @@ -465,6 +468,7 @@ public: | 
| virtual bool tryGetTransferredMessagePort(uint32_t index, v8::Local<v8::Value>*) = 0; | 
| virtual bool tryGetTransferredArrayBuffer(uint32_t index, v8::Local<v8::Value>*) = 0; | 
| virtual bool tryGetTransferredImageBitmap(uint32_t index, v8::Local<v8::Value>*) = 0; | 
| +    virtual bool tryGetTransferredOffscreenCanvas(uint32_t index, uint32_t width, uint32_t height, uint32_t id, v8::Local<v8::Value>*) = 0; | 
| virtual bool tryGetTransferredSharedArrayBuffer(uint32_t index, v8::Local<v8::Value>*) = 0; | 
| virtual bool newSparseArray(uint32_t length) = 0; | 
| virtual bool newDenseArray(uint32_t length) = 0; | 
| @@ -613,6 +617,7 @@ public: | 
| bool tryGetTransferredMessagePort(uint32_t index, v8::Local<v8::Value>*) override; | 
| bool tryGetTransferredArrayBuffer(uint32_t index, v8::Local<v8::Value>*) override; | 
| bool tryGetTransferredImageBitmap(uint32_t index, v8::Local<v8::Value>*) override; | 
| +    bool tryGetTransferredOffscreenCanvas(uint32_t index, uint32_t width, uint32_t height, uint32_t id, v8::Local<v8::Value>*) override; | 
| bool tryGetTransferredSharedArrayBuffer(uint32_t index, v8::Local<v8::Value>*) override; | 
| bool tryGetObjectFromObjectReference(uint32_t reference, v8::Local<v8::Value>*) override; | 
| uint32_t objectReferenceCount() override; | 
|  |