ozone: ClientPixmapManager passes VGEM fd from browser to renderer.

ui/ozone/platform/cast/ozone_platform_cast.cc

Index: ui/ozone/platform/cast/ozone_platform_cast.cc
diff --git a/ui/ozone/platform/cast/ozone_platform_cast.cc b/ui/ozone/platform/cast/ozone_platform_cast.cc
index 60f7c9a901220a23d2ed3f2662da1cdb6a714211..eb91158b203edec0bf96ed022c0cb83f6df7883d 100644
--- a/ui/ozone/platform/cast/ozone_platform_cast.cc
+++ b/ui/ozone/platform/cast/ozone_platform_cast.cc
@@ -67,6 +67,9 @@ class OzonePlatformCast : public OzonePlatform {
   scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate() override {
     return make_scoped_ptr(new NativeDisplayDelegateOzone());
   }
+  base::ScopedFD OpenClientNativePixmapDevice() const override {
+    return base::ScopedFD();
+  }
 
   void InitializeUI() override {
     overlay_manager_.reset(new OverlayManagerCast());