Remove RequestAnimationFrame from mojo, add delayed tasks to RunLoop

mojo/examples/pepper_container_app/graphics_3d_resource.cc

Index: mojo/examples/pepper_container_app/graphics_3d_resource.cc
diff --git a/mojo/examples/pepper_container_app/graphics_3d_resource.cc b/mojo/examples/pepper_container_app/graphics_3d_resource.cc
index 506e74737cf970c1f40a4f1bb588a588e3c4e76b..1fa8675638b2879dc4a5a20e9d85897c2d71bb29 100644
--- a/mojo/examples/pepper_container_app/graphics_3d_resource.cc
+++ b/mojo/examples/pepper_container_app/graphics_3d_resource.cc
@@ -28,7 +28,6 @@ Graphics3DResource::Graphics3DResource(PP_Instance instance)
   ScopedMessagePipeHandle pipe = MojoPpapiGlobals::Get()->CreateGLES2Context();
   context_ = MojoGLES2CreateContext(pipe.release().value(),
                                     &ContextLostThunk,
-                                    &DrawAnimationFrameThunk,
                                     this);
 }
 
@@ -154,10 +153,6 @@ void Graphics3DResource::ContextLostThunk(void* closure) {
   static_cast<Graphics3DResource*>(closure)->ContextLost();
 }
 
-void Graphics3DResource::DrawAnimationFrameThunk(void* closure) {
-  // TODO(yzshen): Use this notification to drive the SwapBuffers() callback.
-}
-
 void Graphics3DResource::ContextLost() {
   PluginInstance* plugin_instance =
       MojoPpapiGlobals::Get()->GetInstance(pp_instance());