ozone: ClientPixmapManager passes VGEM fd from browser to renderer.

ui/ozone/platform/drm/ozone_platform_drm.cc

Index: ui/ozone/platform/drm/ozone_platform_drm.cc
diff --git a/ui/ozone/platform/drm/ozone_platform_drm.cc b/ui/ozone/platform/drm/ozone_platform_drm.cc
index 0d40c719b4f44861e4d0da4501b382e309608665..987f2fe61e5e4235b3514516a05c58922b1aaea2 100644
--- a/ui/ozone/platform/drm/ozone_platform_drm.cc
+++ b/ui/ozone/platform/drm/ozone_platform_drm.cc
@@ -90,6 +90,9 @@ class OzonePlatformDrm : public OzonePlatform {
     return make_scoped_ptr(
         new DrmNativeDisplayDelegate(display_manager_.get()));
   }
+  base::ScopedFD OpenClientNativePixmapDevice() const override {
+    return base::ScopedFD();
+  }
   void InitializeUI() override {
     drm_device_manager_.reset(new DrmDeviceManager(
         scoped_ptr<DrmDeviceGenerator>(new DrmDeviceGenerator())));