gpu: Refactor GpuMemoryBuffer framework for multi-process support.

gpu/command_buffer/common/command_buffer.h

Index: gpu/command_buffer/common/command_buffer.h
diff --git a/gpu/command_buffer/common/command_buffer.h b/gpu/command_buffer/common/command_buffer.h
index 3078bca2ba3af97db63fbdd5ecb9da0180d94cbd..ab50ea05947df5832a9e3a03074867ab716b83fe 100644
--- a/gpu/command_buffer/common/command_buffer.h
+++ b/gpu/command_buffer/common/command_buffer.h
@@ -13,6 +13,10 @@ namespace base {
 class SharedMemory;
 }
 
+namespace gfx {
+class GpuMemoryBuffer;
+}
+
 namespace gpu {
 
 // Common interface for CommandBuffer implementations.
@@ -141,6 +145,17 @@ class GPU_EXPORT CommandBuffer {
   // be used for cross-context synchronization.
   virtual uint32 InsertSyncPoint() = 0;
 
+  // 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(CommandBuffer);
 };