More animation cleanup.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/5154006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@66683 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 30 insertions, 0 deletions

diff --git a/app/animation_container_element.h b/app/animation_container_element.h
new file mode 100644
index 0000000..57793f6
--- /dev/null
+++ b/app/animation_container_element.h
@@ -0,0 +1,30 @@
+// Copyright (c) 2010 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 APP_ANIMATION_CONTAINER_ELEMENT_H_
+#define APP_ANIMATION_CONTAINER_ELEMENT_H_
+#pragma once
+
+#include "base/time.h"
+
+// Interface for the elements the AnimationContainer contains. This is
+// implemented by Animation.
+class AnimationContainerElement {
+ public:
+  // Sets the start of the animation. This is invoked from
+  // AnimationContainer::Start.
+  virtual void SetStartTime(base::TimeTicks start_time) = 0;
+
+  // Invoked when the animation is to progress.
+  virtual void Step(base::TimeTicks time_now) = 0;
+
+  // Returns the time interval of the animation. If an Element needs to change
+  // this it should first invoke Stop, then Start.
+  virtual base::TimeDelta GetTimerInterval() const = 0;
+
+ protected:
+  virtual ~AnimationContainerElement() {}
+};
+
+#endif  // APP_ANIMATION_CONTAINER_ELEMENT_H_