Partial fix for keyboard occlusion.

ui/keyboard/keyboard_controller.h

Index: ui/keyboard/keyboard_controller.h
diff --git a/ui/keyboard/keyboard_controller.h b/ui/keyboard/keyboard_controller.h
index ca7d0ada03ee37eccecc99ebc2fa492b1507349b..35b69fd3d7ae86bdc000118087a6e2c97142cbd7 100644
--- a/ui/keyboard/keyboard_controller.h
+++ b/ui/keyboard/keyboard_controller.h
@@ -7,6 +7,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/observer_list.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/ime/input_method_observer.h"
 #include "ui/keyboard/keyboard_export.h"
@@ -14,7 +15,9 @@
 namespace aura {
 class Window;
 }
-
+namespace gfx {
+class Rect;
+}
 namespace ui {
 class InputMethod;
 class TextInputClient;
@@ -30,6 +33,12 @@ class KeyboardLayoutManager;
 class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
                                            public aura::WindowObserver {
  public:
+  class Observer {
+   public:
+    // Called when the keyboard bounds are about to change.
+    virtual void OnKeyboardBoundsChanged(const gfx::Rect& keyboard_bounds) = 0;
+  };
+
   // Takes ownership of |proxy|.
   explicit KeyboardController(KeyboardControllerProxy* proxy);
   virtual ~KeyboardController();
@@ -38,6 +47,10 @@ class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
   // It is the responsibility of the caller to Show() the returned window.
   aura::Window* GetContainerWindow();
 
+  // Management of the observer list.
+  virtual void AddObserver(Observer* observer);
+  virtual void RemoveObserver(Observer* observer);
+
  private:
   // For access to Observer methods for simulation.
   friend class KeyboardControllerTest;
@@ -57,6 +70,8 @@ class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
   aura::Window* container_;
   ui::InputMethod* input_method_;
 
+  ObserverList<Observer> observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(KeyboardController);
 };