VaapiVideoAccelerator: make Vaapi accelerator work with ozone

ui/ozone/public/surface_factory_ozone.h

Index: ui/ozone/public/surface_factory_ozone.h
diff --git a/ui/ozone/public/surface_factory_ozone.h b/ui/ozone/public/surface_factory_ozone.h
index 62df13e50740423de6567804d69e4c010eb5c40f..ca045cd5538242885294c0be35d1b80cef1f1d49 100644
--- a/ui/ozone/public/surface_factory_ozone.h
+++ b/ui/ozone/public/surface_factory_ozone.h
@@ -83,6 +83,10 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
   // display connection for the native display.
   virtual intptr_t GetNativeDisplay();
 
+  // Returns Drm file descriptor. This is used to obtain access to the
+  // driver interface by other API than GL.
+  virtual int GetDrmFd();

[spang, 2014/09/08 18:04:00]

dnicoara reminded me to point out: We don't intend to approve hooks like this in
general, as this function really is too prescriptive to be in the (platform &
architecture-independent) ozone public interface.

posciak@: We need to work to push VDA construction downwards (out of content),
so that we can avoid adding more of these hooks.

+
   // Create SurfaceOzoneEGL for the specified gfx::AcceleratedWidget.
   //
   // Note: When used from content, this is called in the GPU process. The