Revamp OffscreenCanvas commit flow

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
index bd018fb2bb42717c660af90e3f0df765951d9797..2039f5f53c2ca6c99446ef332be916b4faa2a8f6 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
@@ -1397,15 +1397,19 @@ String HTMLCanvasElement::getIdFromControl(const Element* element) {
   return String();
 }
 
-bool HTMLCanvasElement::createSurfaceLayer() {
+void HTMLCanvasElement::createLayer() {
   DCHECK(!m_surfaceLayerBridge);
   mojom::blink::OffscreenCanvasSurfacePtr service;
   Platform::current()->interfaceProvider()->getInterface(
       mojo::GetProxy(&service));
   m_surfaceLayerBridge =
-      WTF::wrapUnique(new CanvasSurfaceLayerBridge(std::move(service)));
-  return m_surfaceLayerBridge->createSurfaceLayer(this->width(),
-                                                  this->height());
+      WTF::wrapUnique(new CanvasSurfaceLayerBridge(std::move(service), this));
+  // Creates a placeholder layer first before Surface is created.
+  m_surfaceLayerBridge->createSolidColorLayer();
+}
+
+void HTMLCanvasElement::OnWebLayerReplaced() {
+  setNeedsCompositingUpdate();
 }
 
 }  // namespace blink