ozone: ClientPixmapManager passes VGEM fd from browser to renderer.

ui/ozone/platform/caca/ozone_platform_caca.cc

Index: ui/ozone/platform/caca/ozone_platform_caca.cc
diff --git a/ui/ozone/platform/caca/ozone_platform_caca.cc b/ui/ozone/platform/caca/ozone_platform_caca.cc
index fdfebe22402d4d149a200af974b1767513610402..3a5a3e9b769ae81ecd87886ec5a5044d29e9c38f 100644
--- a/ui/ozone/platform/caca/ozone_platform_caca.cc
+++ b/ui/ozone/platform/caca/ozone_platform_caca.cc
@@ -61,6 +61,9 @@ class OzonePlatformCaca : public OzonePlatform {
   scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate() override {
     return make_scoped_ptr(new NativeDisplayDelegateOzone());
   }
+  base::ScopedFD OpenClientNativePixmapDevice() const override {
+    return base::ScopedFD();
+  }
 
   void InitializeUI() override {
     window_manager_.reset(new CacaWindowManager);