gpu: Refactor GpuMemoryBuffer framework for multi-process support.

ppapi/proxy/ppb_graphics_3d_proxy.cc

Index: ppapi/proxy/ppb_graphics_3d_proxy.cc
diff --git a/ppapi/proxy/ppb_graphics_3d_proxy.cc b/ppapi/proxy/ppb_graphics_3d_proxy.cc
index 7d18850ea3c79bb97d588fd6a5a138660fcb2139..b1ceec14e3e5fd7bc2d2198df140a82626401902 100644
--- a/ppapi/proxy/ppb_graphics_3d_proxy.cc
+++ b/ppapi/proxy/ppb_graphics_3d_proxy.cc
@@ -167,6 +167,20 @@ class Graphics3D::LockingCommandBuffer : public gpu::CommandBuffer {
     MaybeLock lock(need_to_lock_);
     return gpu_command_buffer_->InsertSyncPoint();
   }
+  gfx::GpuMemoryBuffer* CreateGpuMemoryBuffer(size_t width,
+                                              size_t height,
+                                              unsigned internalformat,
+                                              int32* id) {
+    MaybeLock lock(need_to_lock_);
+    return gpu_command_buffer_->CreateGpuMemoryBuffer(width,
+                                                      height,
+                                                      internalformat,
+                                                      id);
+  }
+  void DestroyGpuMemoryBuffer(int32 id) {
+    MaybeLock lock(need_to_lock_);
+    gpu_command_buffer_->DestroyGpuMemoryBuffer(id);
+  }
 
   // Weak pointer - see class Graphics3D for the scopted_ptr.
   gpu::CommandBuffer* gpu_command_buffer_;