cc : Stop pushing layers from hidden subtrees at commit

cc/trees/layer_tree_host.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/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1077 matching lines @@
                                  bool* content_is_suitable_for_gpu) {
   base::AutoReset<bool> painting(&in_paint_layer_contents_, true);
   bool did_paint_content = false;
   for (const auto& layer : update_layer_list) {
     did_paint_content |= layer->Update();
     *content_is_suitable_for_gpu &= layer->IsSuitableForGpuRasterization();
   }
   return did_paint_content;
 }
 
+void LayerTreeHost::AddHiddenSurfaceLayerId(Layer* layer) {
+  DCHECK(layer->is_hidden());
+  const SurfaceId* surface_id = layer->GetSurfaceId();
+  if (surface_id)
+    hidden_surface_layer_ids_.push_back(surface_id);
+}
+
+using SurfaceIdsList = std::vector<const SurfaceId*>;
+const SurfaceIdsList* LayerTreeHost::HiddenSurfaceLayerIds() const {
+  return &hidden_surface_layer_ids_;
+}
+
+void LayerTreeHost::ClearHiddenSurfaceLayerIds() {
+  hidden_surface_layer_ids_.clear();
+}
+
 void LayerTreeHost::AddLayerShouldPushProperties(Layer* layer) {
   layers_that_should_push_properties_.insert(layer);
 }
 
 void LayerTreeHost::RemoveLayerShouldPushProperties(Layer* layer) {
   layers_that_should_push_properties_.erase(layer);
 }
 
 std::unordered_set<Layer*>& LayerTreeHost::LayersThatShouldPushProperties() {
   return layers_that_should_push_properties_;
@@ skipping 376 matching lines @@
 void LayerTreeHost::SetNeedsDisplayOnAllLayers() {
   for (auto* layer : *this)
     layer->SetNeedsDisplay();
 }
 
 void LayerTreeHost::SetHasCopyRequest(bool has_copy_request) {
   has_copy_request_ = has_copy_request;
 }
 
 }  // namespace cc