media: replace LUMINANCE_F16 by RG_88 for 9/10-bit h264 videos

cc/resources/video_resource_updater.h

Index: cc/resources/video_resource_updater.h
diff --git a/cc/resources/video_resource_updater.h b/cc/resources/video_resource_updater.h
index a42784c9b999ca948b2ed1f4ee32fb8e09f10cf5..cc41866de736f323d46d4c2e71c900c972a8383a 100644
--- a/cc/resources/video_resource_updater.h
+++ b/cc/resources/video_resource_updater.h
@@ -49,6 +49,7 @@ class CC_EXPORT VideoFrameExternalResources {
   };
 
   ResourceType type;
+  ResourceFormat format;
   std::vector<TextureMailbox> mailboxes;
   std::vector<ReleaseCallbackImpl> release_callbacks;
   bool read_lock_fences_enabled;
@@ -89,6 +90,11 @@ class CC_EXPORT VideoResourceUpdater
                              size_t num,
                              uint16_t* dst);
 
+  ResourceFormat YuvResourceFormat(int bits) const;
+  void UseRGForTesting(bool use_rg_for_testing) {
+    use_rg_for_testing_ = use_rg_for_testing;
+  }
+
  private:
   class PlaneResource {
    public:
@@ -190,6 +196,8 @@ class CC_EXPORT VideoResourceUpdater
   // data transfers.
   ResourceList all_resources_;
 
+  bool use_rg_for_testing_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(VideoResourceUpdater);
 };