Handles users rotating screen too early

ash/rotator/screen_rotation_animator_observer.h

Index: ash/rotator/screen_rotation_animator_observer.h
diff --git a/ash/rotator/screen_rotation_animator_observer.h b/ash/rotator/screen_rotation_animator_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..54f4846d91b7cf5ad0221dcc0258713f4c772100
--- /dev/null
+++ b/ash/rotator/screen_rotation_animator_observer.h
@@ -0,0 +1,23 @@
+#ifndef ASH_ROTATOR_SCREEN_ROTATION_ANIMATOR_OBSERVER_H
+#define ASH_ROTATOR_SCREEN_ROTATION_ANIMATOR_OBSERVER_H
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+class ScreenRotationAnimator;
+
+class ASH_EXPORT ScreenRotationAnimatorObserver {
+ public:
+  ScreenRotationAnimatorObserver(){};

[bruthig, 2017/03/15 23:12:38]

nit: I think the style guide wants a space between '()' and '{}'

[wutao, 2017/03/16 07:37:59]

Done.

[wutao, 2017/03/16 07:40:50]

I run cl format. It removes the space again.

[bruthig, 2017/03/16 20:41:57]

Acknowledged.

+
+  virtual void OnEndedOrAbortedScreenRotationAnimation(
+      ScreenRotationAnimator* animator){};
+
+ protected:
+  virtual ~ScreenRotationAnimatorObserver(){};
+};
+
+}  // namespace ash
+
+#endif  // ASH_ROTATOR_SCREEN_ROTATION_ANIMATOR_OBSERVER_H