Add a simple scheduler for animation frames

examples/ganesh_app/ganesh_view.h

 // Copyright 2014 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 EXAMPLES_GANESH_APP_GANESH_VIEW_H_
 #define EXAMPLES_GANESH_APP_GANESH_VIEW_H_
 
 #include "examples/ganesh_app/ganesh_context.h"
 #include "examples/ganesh_app/mojo_gl_context.h"
 #include "examples/ganesh_app/texture_uploader.h"
+#include "mc/scheduler/scheduler.h"
 #include "mojo/services/public/cpp/view_manager/view_observer.h"
 #include "mojo/services/public/interfaces/surfaces/surface_id.mojom.h"
 
 namespace mojo {
 class Shell;
 }
 
 namespace examples {
 
-class GaneshView : public TextureUploader::Client, public mojo::ViewObserver {
+class GaneshView : public TextureUploader::Client,
+                   public mc::Scheduler::Client,
+                   public mojo::ViewObserver {
  public:
   GaneshView(mojo::Shell* shell, mojo::View* view);
   ~GaneshView();
 
  private:
+  // From ViewObserver
   void OnViewDestroyed(mojo::View* view) override;
   void OnViewBoundsChanged(mojo::View* view,
                            const mojo::Rect& old_bounds,
                            const mojo::Rect& new_bounds) override;
 
+  // From TextureUploader::Client
   void OnSurfaceIdAvailable(mojo::SurfaceIdPtr surface_id) override;
 
-  void Draw(const mojo::Size& size);
+  // From mc::Scheduler::Client
+  void BeginFrame(base::TimeTicks frame_time,
+                  base::TimeTicks deadline) override;
+
+  base::TimeDelta Draw(base::TimeTicks frame_time);
 
   mojo::View* view_;
   MojoGLContext gl_context_;
   GaneshContext gr_context_;
   TextureUploader texture_uploader_;
+  base::TimeTicks base_time_;
+  mc::Scheduler scheduler_;
 
   DISALLOW_COPY_AND_ASSIGN(GaneshView);
 };
 
 }  // namespace examples
 
 #endif  // EXAMPLES_GANESH_APP_GANESH_VIEW_H_