cc: make resource keep video buffer format for hardware overlay.

cc/resources/video_resource_updater.cc

Index: cc/resources/video_resource_updater.cc
diff --git a/cc/resources/video_resource_updater.cc b/cc/resources/video_resource_updater.cc
index fa01b03ad49ad1accbbd3ab44f8d0f2e6ff266e3..9debe54fa4da1e1c7bcacc7381503bd0bbe2d682 100644
--- a/cc/resources/video_resource_updater.cc
+++ b/cc/resources/video_resource_updater.cc
@@ -161,6 +161,7 @@ void VideoResourceUpdater::PlaneResource::SetUniqueId(int unique_frame_id,
 
 VideoFrameExternalResources::VideoFrameExternalResources()
     : type(NONE),
+      pixel_format(media::PIXEL_FORMAT_UNKNOWN),
       read_lock_fences_enabled(false),
       offset(0.0f),
       multiplier(1.0f),
@@ -378,6 +379,7 @@ VideoFrameExternalResources VideoResourceUpdater::CreateForSoftwarePlanes(
 
   VideoFrameExternalResources external_resources;
 
+  external_resources.pixel_format = video_frame->format();
   external_resources.bits_per_channel = bits_per_channel;
 
   if (software_compositor || texture_needs_rgb_conversion) {
@@ -620,6 +622,7 @@ VideoFrameExternalResources VideoResourceUpdater::CreateForHardwarePlanes(
     return VideoFrameExternalResources();
 
   VideoFrameExternalResources external_resources;
+  external_resources.pixel_format = video_frame->format();
   if (video_frame->metadata()->IsTrue(
           media::VideoFrameMetadata::READ_LOCK_FENCES_ENABLED)) {
     external_resources.read_lock_fences_enabled = true;