gpu: Refactor GpuMemoryBuffer framework for multi-process support.

gpu/command_buffer/common/gpu_control.h

+// Copyright (c) 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 GPU_COMMAND_BUFFER_COMMON_GPU_CONTROL_H_
+#define GPU_COMMAND_BUFFER_COMMON_GPU_CONTROL_H_
+
+#include "gpu/gpu_export.h"
+
+namespace gfx {
+class GpuMemoryBuffer;
+}
+
+namespace gpu {
+
+// Common interface for GpuControl implementations.
+class GPU_EXPORT GpuControl {
+ public:
+  GpuControl() {}
+  virtual ~GpuControl() {}
+
+  // Create a gpu memory buffer of the given dimensions and format. Returns
+  // its ID or -1 on error.
+  virtual gfx::GpuMemoryBuffer* CreateGpuMemoryBuffer(
+      size_t width,
+      size_t height,
+      unsigned internalformat,
+      int32* id) = 0;
+
+  // Destroy a gpu memory buffer. The ID must be positive.
+  virtual void DestroyGpuMemoryBuffer(int32 id) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GpuControl);
+};
+
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_COMMON_GPU_CONTROL_H_