Share animations from compositor to main thread.

cc/animation/animation.h

 // Copyright 2012 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.
 
 #ifndef CC_ANIMATION_ANIMATION_H_
 #define CC_ANIMATION_ANIMATION_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "cc/animation/target_property.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
 
 class AnimationCurve;
 
 // An Animation contains all the state required to play an AnimationCurve.
 // Specifically, the affected property, the run state (paused, finished, etc.),
 // loop count, last pause time, and the total time spent paused.
 class CC_EXPORT Animation {
  public:
   // Animations begin in the 'WAITING_FOR_TARGET_AVAILABILITY' state. An
   // Animation waiting for target availibility will run as soon as its target
   // property is free (and all the animations animating with it are also able to
   // run). When this time arrives, the controller will move the animation into
   // the STARTING state, and then into the RUNNING state. RUNNING animations may
   // toggle between RUNNING and PAUSED, and may be stopped by moving into either
   // the ABORTED or FINISHED states. A FINISHED animation was allowed to run to
-  // completion, but an ABORTED animation was not.
+  // completion, but an ABORTED animation was not. An animation in the state
+  // ABORTED_BUT_NEEDS_COMPLETION is an animation that was aborted for
+  // some reason, but needs to be finished. Currently this is for impl-only
+  // scroll offset animations that need to be completed on the main thread.
   enum RunState {
     WAITING_FOR_TARGET_AVAILABILITY = 0,
     WAITING_FOR_DELETION,
     STARTING,
     RUNNING,
     PAUSED,
     FINISHED,
     ABORTED,
+    ABORTED_BUT_NEEDS_COMPLETION,
     // This sentinel must be last.
-    LAST_RUN_STATE = ABORTED
+    LAST_RUN_STATE = ABORTED_BUT_NEEDS_COMPLETION
   };
 
   enum Direction {
     DIRECTION_NORMAL,
     DIRECTION_REVERSE,
     DIRECTION_ALTERNATE,
     DIRECTION_ALTERNATE_REVERSE
   };
 
   enum FillMode {
@@ skipping 184 matching lines @@
   // longer affect any observers, and are deleted.
   bool affects_active_observers_;
   bool affects_pending_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(Animation);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_H_