cc: Add a flag to layers that returns true if the layer is in RSLL.

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 38948c3fa1ab921b01864c448fb5e7fb3d74ee65..7929237dd657bc9dd9962c22684dc69748829a83 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -685,6 +685,18 @@ void TileManager::GetTilesWithAssignedBins(PrioritizedTileSet* tiles) {
   }
 }
 
+void TileManager::CleanUpLayers() {
+  for (int i = 0; i < static_cast<int>(layers_.size()); ++i) {
+    if (layers_[i]->is_render_surface_list_member())
+      continue;
+
+    layers_[i]->DidUnregisterLayer();
+    std::swap(layers_[i], layers_.back());
+    layers_.pop_back();
+    --i;
+  }
+}
+
 void TileManager::ManageTiles(const GlobalStateThatImpactsTilePriority& state) {
   TRACE_EVENT0("cc", "TileManager::ManageTiles");
 
@@ -694,6 +706,8 @@ void TileManager::ManageTiles(const GlobalStateThatImpactsTilePriority& state) {
     prioritized_tiles_dirty_ = true;
   }
 
+  CleanUpLayers();
+
   // We need to call CheckForCompletedTasks() once in-between each call
   // to ScheduleTasks() to prevent canceled tasks from being scheduled.
   if (!did_check_for_completed_tasks_since_last_schedule_tasks_) {