cc: Misc animation refactoring

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 <algorithm>
 #include <stack>
 #include <string>
 
@@ skipping 540 matching lines @@
 void LayerTreeHost::SetAnimationEvents(
     scoped_ptr<AnimationEventsVector> events) {
   DCHECK(proxy_->IsMainThread());
   for (size_t event_index = 0; event_index < events->size(); ++event_index) {
     int event_layer_id = (*events)[event_index].layer_id;
 
     // Use the map of all controllers, not just active ones, since non-active
     // controllers may still receive events for impl-only animations.
     const AnimationRegistrar::AnimationControllerMap& animation_controllers =
         animation_registrar_->all_animation_controllers();
-    AnimationRegistrar::AnimationControllerMap::const_iterator iter =
-        animation_controllers.find(event_layer_id);
+    auto iter = animation_controllers.find(event_layer_id);
     if (iter != animation_controllers.end()) {
       switch ((*events)[event_index].type) {
         case AnimationEvent::STARTED:
           (*iter).second->NotifyAnimationStarted((*events)[event_index]);
           break;
 
         case AnimationEvent::FINISHED:
           (*iter).second->NotifyAnimationFinished((*events)[event_index]);
           break;
 
@@ skipping 614 matching lines @@
   state->EndDictionary();
 }
 
 void LayerTreeHost::AnimateLayers(base::TimeTicks monotonic_time) {
   if (!settings_.accelerated_animation_enabled ||
       animation_registrar_->active_animation_controllers().empty())
     return;
 
   TRACE_EVENT0("cc", "LayerTreeHost::AnimateLayers");
 
-  AnimationRegistrar::AnimationControllerMap copy =
+  AnimationRegistrar::AnimationControllerMap active_controllers_copy =
       animation_registrar_->active_animation_controllers();
-  for (AnimationRegistrar::AnimationControllerMap::iterator iter = copy.begin();
-       iter != copy.end();
-       ++iter) {
-    (*iter).second->Animate(monotonic_time);
+  for (auto& it : active_controllers_copy) {
+    it.second->Animate(monotonic_time);
     bool start_ready_animations = true;
-    (*iter).second->UpdateState(start_ready_animations, NULL);
+    it.second->UpdateState(start_ready_animations, NULL);
   }
 }
 
 UIResourceId LayerTreeHost::CreateUIResource(UIResourceClient* client) {
   DCHECK(client);
 
   UIResourceId next_id = next_ui_resource_id_++;
   DCHECK(ui_resource_client_map_.find(next_id) ==
          ui_resource_client_map_.end());
 
@@ skipping 115 matching lines @@
     bool children_need_begin_frames) const {
   proxy_->SetChildrenNeedBeginFrames(children_need_begin_frames);
 }
 
 void LayerTreeHost::SendBeginFramesToChildren(
     const BeginFrameArgs& args) const {
   client_->SendBeginFramesToChildren(args);
 }
 
 }  // namespace cc