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

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 05f6691c167662afc8a4a943ccfb84d2f8fcff85..853a71ac109909cf23d71733490093c3aae2ee53 100644
--- a/ui/ozone/public/surface_factory_ozone.h
+++ b/ui/ozone/public/surface_factory_ozone.h
@@ -6,6 +6,7 @@
 #define UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 
 #include "base/callback.h"
+#include "base/file_descriptor_posix.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/native_library.h"
 #include "ui/gfx/geometry/rect.h"
@@ -121,6 +122,10 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
       BufferFormat format,
       BufferUsage usage);
 
+  // Export GpuMemoryBufferHandle from |pixmap|.
+  virtual base::FileDescriptor ExportDmaBuf(gfx::AcceleratedWidget widget,
+                                            scoped_refptr<NativePixmap> pixmap);
+
   // Sets the overlay plane to switch to at the next page flip.
   // |w| specifies the screen to display this overlay plane on.
   // |plane_z_order| specifies the stacking order of the plane relative to the