Enable sync allocation of GpuMemoryBuffers from the browser process.

content/common/gpu/client/gpu_memory_buffer_factory_host.h

Index: content/common/gpu/client/gpu_memory_buffer_factory_host.h
diff --git a/content/common/gpu/client/gpu_memory_buffer_factory_host.h b/content/common/gpu/client/gpu_memory_buffer_factory_host.h
index 9e616e27e650ada5805626dc1ea8d94d54c73fb7..cf16c4b9151f53351a9cd23e68945d5b07ed6bc9 100644
--- a/content/common/gpu/client/gpu_memory_buffer_factory_host.h
+++ b/content/common/gpu/client/gpu_memory_buffer_factory_host.h
@@ -28,6 +28,14 @@ class CONTENT_EXPORT GpuMemoryBufferFactoryHost {
       unsigned internalformat,
       unsigned usage,
       const CreateGpuMemoryBufferCallback& callback) = 0;
+  // This function is to be called only for images allocated from the
+  // browser process command buffer. Allocations originating from the renderers
+  // should use the async version of the function.
+  virtual gfx::GpuMemoryBufferHandle CreateGpuMemoryBufferSync(
+      const gfx::GpuMemoryBufferHandle& handle,
+      const gfx::Size& size,
+      unsigned internalformat,
+      unsigned usage) = 0;
   virtual void DestroyGpuMemoryBuffer(const gfx::GpuMemoryBufferHandle& handle,
                                       int32 sync_point) = 0;