12-bit vp9 video support

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 a3a501199341eab044bc33b339fe5851c24492c4..52ccbd85ef29943173c72471d0685f4861b07817 100644
--- a/cc/resources/video_resource_updater.h
+++ b/cc/resources/video_resource_updater.h
@@ -80,6 +80,14 @@ class CC_EXPORT VideoResourceUpdater
   VideoFrameExternalResources CreateExternalResourcesFromVideoFrame(
       scoped_refptr<media::VideoFrame> video_frame);
 
+  // Iterate over src[x], multiply by |mult| and store result in dst[x]
+  // for all x in 0 <= x < num.
+  // Public for testing only.
+  static void MakeHalfFloats(const uint16_t* src,
+                             float mult,
+                             size_t num,
+                             uint16_t* dst);
+
  private:
   class PlaneResource {
    public: