gfx: Fix sending native ozone pixmaps from InProcessCommandBuffer.

ui/gfx/gpu_memory_buffer.h

Index: ui/gfx/gpu_memory_buffer.h
diff --git a/ui/gfx/gpu_memory_buffer.h b/ui/gfx/gpu_memory_buffer.h
index 307fa18a728facfeadc4421f10f418486f25b3f3..35c8970c6dc31ef18b08031d2d2c9d1ebe2228be 100644
--- a/ui/gfx/gpu_memory_buffer.h
+++ b/ui/gfx/gpu_memory_buffer.h
@@ -99,6 +99,12 @@ class GFX_EXPORT GpuMemoryBuffer {
   virtual ClientBuffer AsClientBuffer() = 0;
 };
 
+// Returns an instance of |handle| which can be sent over IPC. This duplicates
+// the file-handles as appropriate, so that the IPC code take ownership of them,
+// without invalidating |handle| itself.
+GFX_EXPORT GpuMemoryBufferHandle
+CloneHandleForIPC(const GpuMemoryBufferHandle& handle);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_GPU_MEMORY_BUFFER_H_