gl: Add YVU_420 support to GLImageOzoneNativePixmap.

ui/ozone/platform/cast/surface_factory_cast.cc

Index: ui/ozone/platform/cast/surface_factory_cast.cc
diff --git a/ui/ozone/platform/cast/surface_factory_cast.cc b/ui/ozone/platform/cast/surface_factory_cast.cc
index 0ec0497cabfffa6c21927c586031a065dcec7d09..f3dbe1cfd0c8bfef07ab0e86c0a2f746885f4d33 100644
--- a/ui/ozone/platform/cast/surface_factory_cast.cc
+++ b/ui/ozone/platform/cast/surface_factory_cast.cc
@@ -254,6 +254,7 @@ scoped_refptr<NativePixmap> SurfaceFactoryCast::CreateNativePixmap(
       return nullptr;
     }
     bool AreDmaBufFdsValid() const override { return false; }
+    size_t GetDmaBufFdCount() const override { return 0; }
     int GetDmaBufFd(size_t plane) const override { return -1; }
     int GetDmaBufPitch(size_t plane) const override { return 0; }
     int GetDmaBufOffset(size_t plane) const override { return 0; }