1 files changed, 33 insertions, 0 deletions
diff --git a/chromium/cc/animation/scrollbar_animation_controller.h b/chromium/cc/animation/scrollbar_animation_controller.h
new file mode 100644
index 00000000000..55d29457689
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+++ b/chromium/cc/animation/scrollbar_animation_controller.h
@@ -0,0 +1,33 @@
+// 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_SCROLLBAR_ANIMATION_CONTROLLER_H_
+#define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_
+
+#include "base/time/time.h"
+#include "cc/base/cc_export.h"
+#include "ui/gfx/vector2d_f.h"
+
+namespace cc {
+
+// This abstract class represents the compositor-side analogy of
+// ScrollbarAnimator.  Individual platforms should subclass it to provide
+// specialized implementation.
+class CC_EXPORT ScrollbarAnimationController {
+ public:
+  virtual ~ScrollbarAnimationController() {}
+
+  virtual bool IsScrollGestureInProgress() const = 0;
+  virtual bool IsAnimating() const = 0;
+  virtual base::TimeDelta DelayBeforeStart(base::TimeTicks now) const = 0;
+
+  virtual bool Animate(base::TimeTicks now) = 0;
+  virtual void DidScrollGestureBegin() = 0;
+  virtual void DidScrollGestureEnd(base::TimeTicks now) = 0;
+  virtual void DidProgrammaticallyUpdateScroll(base::TimeTicks now) = 0;
+};
+
+}  // namespace cc
+
+#endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_