Re-land r92885, which was reverted in r92891.

ppapi/shared_impl/graphics_3d_impl.h

+// Copyright (c) 2011 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_SHARED_IMPL_GRAPHICS_3D_IMPL_H_
+#define PPAPI_SHARED_IMPL_GRAPHICS_3D_IMPL_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "ppapi/c/pp_completion_callback.h"
+#include "ppapi/thunk/ppb_graphics_3d_api.h"
+
+namespace gpu {
+class CommandBuffer;
+namespace gles2 {
+class GLES2CmdHelper;
+class GLES2Implementation;
+}  // namespace gles2
+}  // namespace gpu.
+
+namespace ppapi {
+
+class Graphics3DImpl : public thunk::PPB_Graphics3D_API {
+ public:
+  // PPB_Graphics3D_API implementation.
+  virtual int32_t GetAttribs(int32_t* attrib_list) OVERRIDE;
+  virtual int32_t SetAttribs(int32_t* attrib_list) OVERRIDE;
+  virtual int32_t SwapBuffers(PP_CompletionCallback callback) OVERRIDE;
+
+  gpu::gles2::GLES2Implementation* gles2_impl() {
+    return gles2_impl_.get();
+  }
+
+  // Sends swap-buffers notification to the plugin.
+  void SwapBuffersACK(int32_t pp_error);
+
+ protected:
+  Graphics3DImpl();
+  virtual ~Graphics3DImpl();
+
+  virtual gpu::CommandBuffer* GetCommandBuffer() = 0;
+  virtual int32 DoSwapBuffers() = 0;
+
+  bool HasPendingSwap() { return swap_callback_.func != NULL; }
+  bool CreateGLES2Impl(int32 command_buffer_size,
+                       int32 transfer_buffer_size);
+  void DestroyGLES2Impl();
+
+ private:
+  int32 transfer_buffer_id_;
+  scoped_ptr<gpu::gles2::GLES2CmdHelper> gles2_helper_;
+  scoped_ptr<gpu::gles2::GLES2Implementation> gles2_impl_;
+
+  // Callback that needs to be executed when swap-buffers is completed.
+  PP_CompletionCallback swap_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(Graphics3DImpl);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_GRAPHICS_3D_IMPL_H_
+