Add ShellDelegate, MediaDelegate and KeyboardUI stubs to mus ash

ash/common/gpu_support.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 ASH_GPU_SUPPORT_H_
-#define ASH_GPU_SUPPORT_H_
+#ifndef ASH_COMMON_GPU_SUPPORT_H_
+#define ASH_COMMON_GPU_SUPPORT_H_
 
 #include <list>
 
 #include "ash/ash_export.h"
 #include "base/callback_forward.h"
 #include "base/process/process.h"
 
 namespace ash {
 
 // An interface to allow use of content::GpuDataManager to be injected in
 // configurations that permit a dependency on content.
 class ASH_EXPORT GPUSupport {
  public:
   typedef base::Callback<void(const std::list<base::ProcessHandle>&)>
       GetGpuProcessHandlesCallback;
 
   virtual ~GPUSupport() {}
 
   virtual bool IsPanelFittingDisabled() const = 0;
 
   virtual void DisableGpuWatchdog() = 0;
 
   virtual void GetGpuProcessHandles(
       const GetGpuProcessHandlesCallback& callback) const = 0;
 };
 
 }  // namespace ash
 
-#endif  // ASH_GPU_SUPPORT_H_
+#endif  // ASH_COMMON_GPU_SUPPORT_H_