Added a views::test::TestInkDropAnimationObserverHelper

ui/views/animation/ink_drop_animation_ended_reason.h

Index: ui/views/animation/ink_drop_animation_ended_reason.h
diff --git a/ui/views/animation/ink_drop_animation_ended_reason.h b/ui/views/animation/ink_drop_animation_ended_reason.h
new file mode 100644
index 0000000000000000000000000000000000000000..fc2f359cef21bbb313c8dd5e8f41d517763e98c6
--- /dev/null
+++ b/ui/views/animation/ink_drop_animation_ended_reason.h
@@ -0,0 +1,25 @@
+// Copyright 2016 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 UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_ENDED_REASON_H_
+#define UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_ENDED_REASON_H_
+
+#include <string>
+
+namespace views {
+
+// Enumeration of the different reasons why an ink drop animation has finished.
+enum class InkDropAnimationEndedReason {
+  // The animation was completed successfully.
+  SUCCESS,
+  // The animation was stopped prematurely before reaching its final state.
+  PRE_EMPTED
+};
+
+// Returns a human readable string for |reason|.  Useful for logging.
+std::string ToString(InkDropAnimationEndedReason reason);
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_ENDED_REASON_H_