Plumbs ::didCompleteSwapBuffers in CompositorCC

ui/gfx/compositor/compositor.cc

Index: ui/gfx/compositor/compositor.cc
diff --git a/ui/gfx/compositor/compositor.cc b/ui/gfx/compositor/compositor.cc
index 97508f3bb9130d237f121b0c168562e4e4eec69f..7d0212f6214d8e73e4f43bc5b751c6dc8b900934 100644
--- a/ui/gfx/compositor/compositor.cc
+++ b/ui/gfx/compositor/compositor.cc
@@ -51,7 +51,9 @@ void Compositor::Draw(bool force_clear) {
 
   NotifyStart(force_clear);
   DrawTree();
-  NotifyEnd();
+  if (!CompositesAsynchronously()) {
+    NotifyEnd();
+  }
 }
 
 void Compositor::AddObserver(CompositorObserver* observer) {
@@ -74,6 +76,10 @@ void Compositor::DrawTree() {
   root_layer_->DrawTree();
 }
 
+bool Compositor::CompositesAsynchronously() {
+  return false;
+}
+
 void Compositor::SwizzleRGBAToBGRAAndFlip(unsigned char* pixels,
                                           const gfx::Size& image_size) {
   // Swizzle from RGBA to BGRA
@@ -97,10 +103,6 @@ void Compositor::SwizzleRGBAToBGRAAndFlip(unsigned char* pixels,
   }
 }
 
-void Compositor::NotifyStart(bool clear) {
-  OnNotifyStart(clear);
-}
-
 void Compositor::NotifyEnd() {
   OnNotifyEnd();
   FOR_EACH_OBSERVER(CompositorObserver,
@@ -108,4 +110,8 @@ void Compositor::NotifyEnd() {
                     OnCompositingEnded(this));
 }
 
+void Compositor::NotifyStart(bool clear) {
+  OnNotifyStart(clear);
+}
+
 }  // namespace ui