Compositing Layer update for OffscreenCanvas resize

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

Index: third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.h
diff --git a/third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.h b/third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.h
index de6d5c82e871e0d7d510089d5f3fa163c9938213..c7a033c3c446348e82d1f93748083f846d67c2f0 100644
--- a/third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.h
+++ b/third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.h
@@ -7,6 +7,7 @@
 
 #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>
@@ -20,7 +21,8 @@ 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();
@@ -31,10 +33,17 @@ class PLATFORM_EXPORT CanvasSurfaceLayerBridge {
   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;
 };