Remove RequestAnimationFrame from mojo, add delayed tasks to RunLoop

mojo/examples/sample_app/gles2_client_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_EXAMPLES_SAMPLE_APP_GLES2_CLIENT_IMPL_H_
 #define MOJO_EXAMPLES_SAMPLE_APP_GLES2_CLIENT_IMPL_H_
 
 #include "mojo/examples/sample_app/spinning_cube.h"
 #include "mojo/public/c/gles2/gles2.h"
 #include "mojo/services/public/interfaces/geometry/geometry.mojom.h"
 #include "mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
 
 namespace examples {
 
 class GLES2ClientImpl {
  public:
   explicit GLES2ClientImpl(mojo::CommandBufferPtr command_buffer);
   virtual ~GLES2ClientImpl();
 
   void SetSize(const mojo::Size& size);
   void HandleInputEvent(const mojo::Event& event);
+  void Draw();
 
  private:
   void ContextLost();
   static void ContextLostThunk(void* closure);
-  void DrawAnimationFrame();
-  static void DrawAnimationFrameThunk(void* closure);
-
-  void RequestAnimationFrames();
-  void CancelAnimationFrames();
+  void WantToDraw();
 
   MojoTimeTicks last_time_;
   mojo::Size size_;
   SpinningCube cube_;
   mojo::Point capture_point_;
   mojo::Point last_drag_point_;
   MojoTimeTicks drag_start_time_;
-  bool getting_animation_frames_;
+  bool waiting_to_draw_;
 
   MojoGLES2Context context_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(GLES2ClientImpl);
 };
 
 }  // namespace examples
 
 #endif  // MOJO_EXAMPLES_SAMPLE_APP_GLES2_CLIENT_IMPL_H_