GBM Ozone implementation

ui/ozone/platform/dri/dri_surface.cc

Index: ui/ozone/platform/dri/dri_surface.cc
diff --git a/ui/ozone/platform/dri/dri_surface.cc b/ui/ozone/platform/dri/dri_surface.cc
index 6b296cc2a7ed32a1faca1cb3b9faef28993525e9..d6b4f5996b27a4b838c1ee240275f324bab2055b 100644
--- a/ui/ozone/platform/dri/dri_surface.cc
+++ b/ui/ozone/platform/dri/dri_surface.cc
@@ -66,6 +66,10 @@ void DriSurface::SwapBuffers() {
   front_buffer_ ^= 1;
 }
 
+gfx::Size DriSurface::Size() const {
+  return size_;
+}
+
 SkCanvas* DriSurface::GetDrawableForWidget() {
   CHECK(backbuffer());
   return backbuffer()->canvas();