Revert of Mojo multiple command buffer support and sample

mojo/services/native_viewport/native_viewport_impl.h

Index: mojo/services/native_viewport/native_viewport_impl.h
diff --git a/mojo/services/native_viewport/native_viewport_impl.h b/mojo/services/native_viewport/native_viewport_impl.h
index b57c36a4946cf28bfdb6ca240246c69a43a4ddf9..5d26da582511aa7fa315ca3e8de507619a2016bb 100644
--- a/mojo/services/native_viewport/native_viewport_impl.h
+++ b/mojo/services/native_viewport/native_viewport_impl.h
@@ -6,6 +6,7 @@
 #define MOJO_SERVICES_NATIVE_VIEWPORT_IMPL_H_
 
 #include "base/memory/weak_ptr.h"
+#include "mojo/services/gles2/command_buffer_impl.h"
 #include "mojo/services/native_viewport/platform_viewport.h"
 #include "mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
 
@@ -27,6 +28,8 @@
   virtual void Hide() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void SetBounds(RectPtr bounds) OVERRIDE;
+  virtual void CreateGLES2Context(
+      InterfaceRequest<CommandBuffer> command_buffer_request) OVERRIDE;
 
   // PlatformViewport::Delegate implementation.
   virtual void OnBoundsChanged(const gfx::Rect& bounds) OVERRIDE;
@@ -36,11 +39,15 @@
   virtual void OnDestroyed() OVERRIDE;
 
   void AckEvent();
+  void CreateCommandBufferIfNeeded();
 
  private:
+  void AckDestroyed();
 
   gfx::AcceleratedWidget widget_;
   scoped_ptr<PlatformViewport> platform_viewport_;
+  InterfaceRequest<CommandBuffer> command_buffer_request_;
+  scoped_ptr<CommandBufferImpl> command_buffer_;
   bool waiting_for_event_ack_;
   base::WeakPtrFactory<NativeViewportImpl> weak_factory_;
 };