Implement convertToBlob() in OffscreenCanvas

third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef OffscreenCanvas_h
 #define OffscreenCanvas_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/canvas/CanvasImageSource.h"
+#include "core/offscreencanvas/ImageEncodeOptions.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/OffscreenCanvasFrameDispatcher.h"
 #include "platform/heap/Handle.h"
 #include <memory>
 
 namespace blink {
 
 class CanvasContextCreationAttributes;
 class ImageBitmap;
 class
@@ skipping 11 matching lines @@
   static OffscreenCanvas* create(unsigned width, unsigned height);
 
   // IDL attributes
   unsigned width() const { return m_size.width(); }
   unsigned height() const { return m_size.height(); }
   void setWidth(unsigned, ExceptionState&);
   void setHeight(unsigned, ExceptionState&);
 
   // API Methods
   ImageBitmap* transferToImageBitmap(ExceptionState&);
+  ScriptPromise convertToBlob(ScriptState*,
+                              const ImageEncodeOptions&,
+                              ExceptionState&);
 
   IntSize size() const { return m_size; }
   void setAssociatedCanvasId(int canvasId) { m_canvasId = canvasId; }
   int getAssociatedCanvasId() const { return m_canvasId; }
   bool isNeutered() const { return m_isNeutered; }
   void setNeutered();
   CanvasRenderingContext* getCanvasRenderingContext(
       ScriptState*,
       const String&,
       const CanvasContextCreationAttributes&);
@@ skipping 44 matching lines @@
   explicit OffscreenCanvas(const IntSize&);
 
   using ContextFactoryVector =
       Vector<std::unique_ptr<CanvasRenderingContextFactory>>;
   static ContextFactoryVector& renderingContextFactories();
   static CanvasRenderingContextFactory* getRenderingContextFactory(int);
 
   Member<CanvasRenderingContext> m_context;
   int m_canvasId = -1;  // DOMNodeIds starts from 0, using -1 to indicate no
                         // associated canvas element.
+
   IntSize m_size;
   bool m_isNeutered = false;
 
   bool m_originClean;
   bool m_disableReadingFromCanvas = false;
 
   bool isPaintable() const;
 
   std::unique_ptr<OffscreenCanvasFrameDispatcher> m_frameDispatcher;
   // cc::SurfaceId is broken into three integer components as this can be used
   // in transfer of OffscreenCanvas across threads
   // If this object is not created via
   // HTMLCanvasElement.transferControlToOffscreen(),
   // then the following members would remain as initialized zero values.
   uint32_t m_clientId = 0;
   uint32_t m_sinkId = 0;
   uint32_t m_localId = 0;
   uint64_t m_nonce = 0;
 };
 
 }  // namespace blink
 
 #endif  // OffscreenCanvas_h