Revert "cc: Remove layers that are not drawn from tile manager."

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 0f13a93466ae6361196d6620a3e16c4fa35b66de..1c04d077f106ecabe69a71cd6b4d5482b4f5aceb 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -678,19 +678,6 @@ void TileManager::GetTilesWithAssignedBins(PrioritizedTileSet* tiles) {
   }
 }
 
-void TileManager::CleanUpLayers() {
-  for (size_t i = 0; i < layers_.size(); ++i) {
-    if (layers_[i]->IsDrawnRenderSurfaceLayerListMember())
-      continue;
-
-    layers_[i]->DidUnregisterLayer();
-    std::swap(layers_[i], layers_.back());
-    layers_.pop_back();
-    --i;
-    prioritized_tiles_dirty_ = true;
-  }
-}
-
 void TileManager::ManageTiles(const GlobalStateThatImpactsTilePriority& state) {
   TRACE_EVENT0("cc", "TileManager::ManageTiles");
 
@@ -700,8 +687,6 @@ 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_) {