Partial fix for keyboard occlusion.

ui/keyboard/keyboard_controller_observer.h

+// Copyright (c) 2013 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_KEYBOARD_KEYBOARD_CONTROLLER_OBSERVER_H_
+#define UI_KEYBOARD_KEYBOARD_CONTROLLER_OBSERVER_H_
+
+#include "ui/keyboard/keyboard_export.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace keyboard {
+
+// Observers to the KeyboardController are notified of significant events that
+// occur with the keyboard, such as the bounds or visiility changing.
+class KEYBOARD_EXPORT KeyboardControllerObserver {
+ public:
+  // Called when the keyboard bounds or visibility are about to change.
+  virtual void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) = 0;
+};
+
+}  // namespace keyboard
+
+#endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_OBSERVER_H_