Animated Rotation

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 1d68ffc4ac8cea9f922737c5c7180f68b6dba31f..92b28d81671da7802ecbf04e3a1717b4fb658707 100644
--- a/ui/gfx/compositor/compositor.cc
+++ b/ui/gfx/compositor/compositor.cc
@@ -3,13 +3,29 @@
 // found in the LICENSE file.
 
 #include "ui/gfx/compositor/compositor.h"
+#include "ui/gfx/compositor/compositor_observer.h"
 
 namespace ui {
 
-// static
-Compositor* Compositor::Create(gfx::AcceleratedWidget widget,
-                               const gfx::Size& size) {
-  return NULL;
+void Compositor::NotifyStart() {
+  OnNotifyStart();
+  // Could potentially notify observers here.
 }
 
+void Compositor::NotifyEnd() {
+  OnNotifyEnd();
+  FOR_EACH_OBSERVER(CompositorObserver,
+                    observer_list_,
+                    OnCompositingEnded());
+}
+
+void Compositor::AddObserver(CompositorObserver* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void Compositor::RemoveObserver(CompositorObserver* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
+
 }  // namespace ui