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 78 matching lines @@
       clip_tree_index_(ClipTree::kInvalidNodeId),
       scroll_tree_index_(ScrollTree::kInvalidNodeId),
       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 1040 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->SetPosition(inputs_.position);
   layer->set_should_flatten_transform_from_property_tree(
       should_flatten_transform_from_property_tree_);
   layer->set_draw_blend_mode(draw_blend_mode_);
@@ skipping 189 matching lines @@
   // TODO(nyquist): Figure out what to do with debug info. See crbug.com/570372.
 
   base->set_transform_free_index(transform_tree_index_);
   base->set_effect_tree_index(effect_tree_index_);
   base->set_clip_tree_index(clip_tree_index_);
   base->set_scroll_tree_index(scroll_tree_index_);
   Vector2dFToProto(offset_to_transform_parent_,
                    base->mutable_offset_to_transform_parent());
   base->set_double_sided(inputs_.double_sided);
   base->set_draws_content(draws_content_);
+  base->set_may_contain_video(may_contain_video_);
   base->set_hide_layer_and_subtree(inputs_.hide_layer_and_subtree);
   base->set_subtree_property_changed(subtree_property_changed_);
   base->set_layer_property_changed(layer_property_changed_);
 
   // TODO(nyquist): Add support for serializing FilterOperations for
   // |filters_| and |background_filters_|. See crbug.com/541321.
 
   base->set_masks_to_bounds(inputs_.masks_to_bounds);
   base->set_main_thread_scrolling_reasons(
       inputs_.main_thread_scrolling_reasons);
@@ skipping 70 matching lines @@
   inputs_.bounds = ProtoToSize(base.bounds());
 
   transform_tree_index_ = base.transform_free_index();
   effect_tree_index_ = base.effect_tree_index();
   clip_tree_index_ = base.clip_tree_index();
   scroll_tree_index_ = base.scroll_tree_index();
   offset_to_transform_parent_ =
       ProtoToVector2dF(base.offset_to_transform_parent());
   inputs_.double_sided = base.double_sided();
   draws_content_ = base.draws_content();
+  may_contain_video_ = base.may_contain_video();
   inputs_.hide_layer_and_subtree = base.hide_layer_and_subtree();
   subtree_property_changed_ = base.subtree_property_changed();
   layer_property_changed_ = base.layer_property_changed();
   inputs_.masks_to_bounds = base.masks_to_bounds();
   inputs_.main_thread_scrolling_reasons = base.main_thread_scrolling_reasons();
   inputs_.non_fast_scrollable_region =
       RegionFromProto(base.non_fast_scrollable_region());
   inputs_.touch_event_handler_region =
       RegionFromProto(base.touch_event_handler_region());
   inputs_.contents_opaque = base.contents_opaque();
@@ skipping 137 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 255 matching lines @@
   DCHECK_NE(transform_tree_index_, TransformTree::kInvalidNodeId);
   return draw_property_utils::ScreenSpaceTransform(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 LayerTree* Layer::GetLayerTree() const {
   return layer_tree_;
 }
 
 }  // namespace cc