services/ui: Detect when a video is playing

cc/layers/video_layer_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/video_layer_impl.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 33 matching lines @@
 }
 
 VideoLayerImpl::VideoLayerImpl(
     LayerTreeImpl* tree_impl,
     int id,
     scoped_refptr<VideoFrameProviderClientImpl> provider_client_impl,
     media::VideoRotation video_rotation)
     : LayerImpl(tree_impl, id),
       provider_client_impl_(std::move(provider_client_impl)),
       frame_(nullptr),
-      video_rotation_(video_rotation) {}
+      video_rotation_(video_rotation) {
+  set_may_contain_video(true);
+}
 
 VideoLayerImpl::~VideoLayerImpl() {
   if (!provider_client_impl_->Stopped()) {
     // In impl side painting, we may have a pending and active layer
     // associated with the video provider at the same time. Both have a ref
     // on the VideoFrameProviderClientImpl, but we stop when the first
     // LayerImpl (the one on the pending tree) is destroyed since we know
     // the main thread is blocked for this commit.
     DCHECK(layer_tree_impl()->task_runner_provider()->IsImplThread());
     DCHECK(layer_tree_impl()->task_runner_provider()->IsMainThreadBlocked());
@@ skipping 332 matching lines @@
 void VideoLayerImpl::SetNeedsRedraw() {
   SetUpdateRect(gfx::UnionRects(update_rect(), gfx::Rect(bounds())));
   layer_tree_impl()->SetNeedsRedraw();
 }
 
 const char* VideoLayerImpl::LayerTypeAsString() const {
   return "cc::VideoLayerImpl";
 }
 
 }  // namespace cc