Partial fix for keyboard occlusion.

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index e4472e0de8a860641efc12aa20939692ab2bbd04..3dbc7a918b49402d3eb8565fb3a8d3795ec81a4f 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -463,6 +463,10 @@ void RootWindowController::InitKeyboard() {
         Shell::GetInstance()->delegate()->CreateKeyboardControllerProxy();
     keyboard_controller_.reset(
         new keyboard::KeyboardController(proxy));
+
+    keyboard_controller_->AddObserver(shelf()->shelf_layout_manager());
+    keyboard_controller_->AddObserver(panel_layout_manager_);
+
     aura::Window* keyboard_container =
         keyboard_controller_->GetContainerWindow();
     parent->AddChild(keyboard_container);