Compositing Layer update for OffscreenCanvas resize

third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.h

 // Copyright 2016 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 CanvasSurfaceLayerBridge_h
 #define CanvasSurfaceLayerBridge_h
 
 #include "base/memory/ref_counted.h"
 #include "cc/surfaces/surface_id.h"
+#include "mojo/public/cpp/bindings/binding.h"
 #include "platform/PlatformExport.h"
 #include "public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom-blink.h"
 #include <memory>
 
 namespace cc {
 class SurfaceLayer;
 struct SurfaceSequence;
 }  // namespace cc
 
 namespace blink {
 
 class WebLayer;
 
-class PLATFORM_EXPORT CanvasSurfaceLayerBridge {
+class PLATFORM_EXPORT CanvasSurfaceLayerBridge
+    : WTF_NON_EXPORTED_BASE(public mojom::blink::OffscreenCanvasSurfaceClient) {
  public:
   explicit CanvasSurfaceLayerBridge(mojom::blink::OffscreenCanvasSurfacePtr);
   ~CanvasSurfaceLayerBridge();
   bool createSurfaceLayer(int canvasWidth, int canvasHeight);
   WebLayer* getWebLayer() const { return m_webLayer.get(); }
   const cc::SurfaceId& getSurfaceId() const { return m_surfaceId; }
 
   void satisfyCallback(const cc::SurfaceSequence&);
   void requireCallback(const cc::SurfaceId&, const cc::SurfaceSequence&);
 
+  // Implementation of mojom::blink::OffscreenCanvasSurfaceClient
+  void OnSurfaceSizeChanged(const cc::SurfaceId& newSurfaceId,
+                            uint32_t newWidth,
+                            uint32_t newHeight) override;
+
  private:
+  void createNewSurfaceLayer(const cc::SurfaceId&, gfx::Size);
   scoped_refptr<cc::SurfaceLayer> m_surfaceLayer;
   std::unique_ptr<WebLayer> m_webLayer;
   mojom::blink::OffscreenCanvasSurfacePtr m_service;
+  mojo::Binding<mojom::blink::OffscreenCanvasSurfaceClient> m_binding;
   cc::SurfaceId m_surfaceId;
 };
 
 }  // namespace blink
 
 #endif  // CanvasSurfaceLayerBridge_h