CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

cc/animation/animation_id_provider.cc

 // Copyright (c) 2013 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 "base/atomic_sequence_num.h"
 #include "cc/animation/animation_id_provider.h"
 
 namespace cc {
 
 base::StaticAtomicSequenceNumber g_next_animation_id;
 base::StaticAtomicSequenceNumber g_next_group_id;
+base::StaticAtomicSequenceNumber g_next_player_id;
 
 int AnimationIdProvider::NextAnimationId() {
   // Animation IDs start from 1.
   return g_next_animation_id.GetNext() + 1;
 }
 
 int AnimationIdProvider::NextGroupId() {
   // Animation group IDs start from 1.
   return g_next_group_id.GetNext() + 1;
 }
 
+int AnimationIdProvider::NextPlayerId() {
+  // Animation player IDs start from 1.
+  return g_next_player_id.GetNext() + 1;
+}
+
 }  // namespace cc