NOT FOR REVIEW - convert to cc animation

cc/animation/animation_observer.h

Index: cc/animation/animation_observer.h
diff --git a/cc/animation/animation_observer.h b/cc/animation/animation_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..4d5c650ce4e0e8fc1f24c4027ee5788ec28c8801
--- /dev/null
+++ b/cc/animation/animation_observer.h
@@ -0,0 +1,42 @@
+// Copyright 2017 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_OBSERVER_H_
+#define CC_ANIMATION_ANIMATION_OBSERVER_H_
+
+#include "cc/animation/animation_export.h"
+#include "ui/gfx/geometry/scroll_offset.h"
+#include "ui/gfx/geometry/size_f.h"
+#include "ui/gfx/transform.h"
+
+namespace cc {
+
+class FilterOperations;
+class TransformOperations;
+
+class CC_ANIMATION_EXPORT AnimationObserver {
+ public:
+  virtual ~AnimationObserver() {}
+  virtual void NotifyClientOpacityAnimated(float opacity,
+                                           bool notify_active_elements,
+                                           bool notify_pending_elements) {}
+  virtual void NotifyClientTransformOperationsAnimated(
+      const TransformOperations& operations,
+      bool notify_active_elements,
+      bool notify_pending_elements) {}
+  virtual void NotifyClientFilterAnimated(const FilterOperations& filter,
+                                          bool notify_active_elements,
+                                          bool notify_pending_elements) {}
+  virtual void NotifyClientScrollOffsetAnimated(
+      const gfx::ScrollOffset& scroll_offset,
+      bool notify_active_elements,
+      bool notify_pending_elements) {}
+  virtual void NotifyClientBoundsAnimated(const gfx::SizeF& size,
+                                          bool notify_active_elements,
+                                          bool notify_pending_elements) {}
+};
+
+}  // namespace cc
+
+#endif  // CC_ANIMATION_ANIMATION_OBSERVER_H_