ozone: Implement zero/one-copy texture for Ozone GBM.

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 121bd0290f1bdd53c1c499f4cc1982cd769fbd6d..638d0c765d2feec14137b36969fb1fd18d2ffadc 100644
--- a/ui/gfx/gpu_memory_buffer.h
+++ b/ui/gfx/gpu_memory_buffer.h
@@ -32,6 +32,8 @@ struct GFX_EXPORT GpuMemoryBufferHandle {
   base::SharedMemoryHandle handle;
 #if defined(OS_MACOSX)
   uint32 io_surface_id;
+#elif defined(USE_OZONE)
+  base::SharedMemoryHandle device_handle;

[reveman, 2015/05/11 16:40:56]

Please use |handle| instead.

[dshwang, 2015/05/14 12:25:47]

|handle| is used for prime fd, and |device_handle| is used for vgem fd.

[reveman, 2015/05/14 13:22:03]

Is the device_handle different for each buffer? If not, then I don't think it
belongs here.

[dshwang, 2015/05/14 14:58:15]

|device_handle| is kind of singleton. I'll make
(Child|Browser)GpuMemoryBufferManager keep vgem fd once to remove it in
GpuMemoryBufferHandle.

 #endif
 };