add missing headers in gpu code

content/renderer/gpu/input_handler_manager_client.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 CONTENT_RENDERER_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_
 #define CONTENT_RENDERER_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_
 
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/vector2d_f.h"
 
 namespace ui {
 struct LatencyInfo;
 }
 
 namespace cc {
 class InputHandler;
@@ skipping 31 matching lines @@
  protected:
   InputHandlerManagerClient() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputHandlerManagerClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_