reconstitute moving 3d out of dev CL. (previous attempt was reverted)

ppapi/cpp/dev/graphics_3d_client_dev.h

-// Copyright (c) 2010 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 PPAPI_CPP_DEV_GRAPHICS_3D_CLIENT_DEV_H_
-#define PPAPI_CPP_DEV_GRAPHICS_3D_CLIENT_DEV_H_
-
-#include "ppapi/c/pp_stdint.h"
-
-namespace pp {
-
-class Instance;
-class Rect;
-class Scrollbar_Dev;
-class Widget_Dev;
-
-// This class provides a C++ interface for callbacks related to 3D. You
-// would normally use multiple inheritance to derive from this class in your
-// instance.
-class Graphics3DClient_Dev {
- public:
-  Graphics3DClient_Dev(Instance* instance);
-  virtual ~Graphics3DClient_Dev();
-
-  /**
-   * Notification that the context was lost for the 3D devices.
-   */
-  virtual void Graphics3DContextLost() = 0;
-
- private:
-  Instance* associated_instance_;
-};
-
-}  // namespace pp
-
-#endif  // PPAPI_CPP_DEV_GRAPHICS_3D_CLIENT_DEV_H_