CC Animation: Replace AnimiationEventsVector with AnimiationEvents class.

cc/animation/animation_events.h

Index: cc/animation/animation_events.h
diff --git a/cc/animation/animation_events.h b/cc/animation/animation_events.h
index d2681628f81709f8583e098bddeaf0fc840e0c92..63645ec19e9a343bc35b83e0648f0eb3153be36a 100644
--- a/cc/animation/animation_events.h
+++ b/cc/animation/animation_events.h
@@ -34,7 +34,13 @@ struct CC_EXPORT AnimationEvent {
   FilterOperations filters;
 };
 
-typedef std::vector<AnimationEvent> AnimationEventsVector;
+class CC_EXPORT AnimationEvents {
+ public:
+  AnimationEvents();
+  ~AnimationEvents();
+
+  std::vector<AnimationEvent> events_;
+};
 
 }  // namespace cc