services/ui: Detect when a video is playing

cc/layers/layer.cc

 // Copyright 2010 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/layer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 77 matching lines @@
       clip_tree_index_(-1),
       scroll_tree_index_(-1),
       property_tree_sequence_number_(-1),
       should_flatten_transform_from_property_tree_(false),
       draws_content_(false),
       use_local_transform_for_backface_visibility_(false),
       should_check_backface_visibility_(false),
       force_render_surface_for_testing_(false),
       subtree_property_changed_(false),
       layer_property_changed_(false),
+      may_contain_video_(false),
       safe_opaque_background_color_(0),
       draw_blend_mode_(SkXfermode::kSrcOver_Mode),
       num_unclipped_descendants_(0) {}
 
 Layer::~Layer() {
   // Our parent should be holding a reference to us so there should be no
   // way for us to be destroyed while we still have a parent.
   DCHECK(!parent());
   // Similarly we shouldn't have a layer tree host since it also keeps a
   // reference to us.
@@ skipping 1029 matching lines @@
   layer->SetTransformTreeIndex(transform_tree_index());
   layer->SetEffectTreeIndex(effect_tree_index());
   layer->SetClipTreeIndex(clip_tree_index());
   layer->SetScrollTreeIndex(scroll_tree_index());
   layer->set_offset_to_transform_parent(offset_to_transform_parent_);
   layer->SetDrawsContent(DrawsContent());
   // subtree_property_changed_ is propagated to all descendants while building
   // property trees. So, it is enough to check it only for the current layer.
   if (subtree_property_changed_ || layer_property_changed_)
     layer->NoteLayerPropertyChanged();
+  layer->set_may_contain_video(may_contain_video_);
   layer->SetMasksToBounds(inputs_.masks_to_bounds);
   layer->set_main_thread_scrolling_reasons(
       inputs_.main_thread_scrolling_reasons);
   layer->SetNonFastScrollableRegion(inputs_.non_fast_scrollable_region);
   layer->SetTouchEventHandlerRegion(inputs_.touch_event_handler_region);
   layer->SetContentsOpaque(inputs_.contents_opaque);
   layer->SetBlendMode(inputs_.blend_mode);
   layer->SetPosition(inputs_.position);
   layer->set_should_flatten_transform_from_property_tree(
       should_flatten_transform_from_property_tree_);
@@ skipping 434 matching lines @@
   SetNeedsPushProperties();
 }
 
 void Layer::SetLayerPropertyChanged() {
   if (layer_property_changed_)
     return;
   layer_property_changed_ = true;
   SetNeedsPushProperties();
 }
 
+void Layer::SetMayContainVideo(bool yes) {
+  if (may_contain_video_ == yes)
+    return;
+  may_contain_video_ = yes;
+  SetNeedsPushProperties();
+}
+
 bool Layer::FilterIsAnimating() const {
   return GetAnimationHost()->IsAnimatingFilterProperty(
       element_id(), GetElementTypeForAnimation());
 }
 
 bool Layer::TransformIsAnimating() const {
   return GetAnimationHost()->IsAnimatingTransformProperty(
       element_id(), GetElementTypeForAnimation());
 }
 
@@ skipping 251 matching lines @@
       ->num_copy_requests_in_subtree;
 }
 
 gfx::Transform Layer::screen_space_transform() const {
   DCHECK_NE(transform_tree_index_, -1);
   return draw_property_utils::ScreenSpaceTransform(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc