IME (input method editor) support for Aura, part 3 of 3: Use ui::InputMethod in ash.

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index ddefbe709222e4aa420a6d610959604067010447..a95d817751090f14519ac4569162c60e93e8adec 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -26,6 +26,7 @@ class Size;
 }
 
 namespace ui {
+class InputMethod;
 class LayerAnimationSequence;
 class Transform;
 }
@@ -61,6 +62,10 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   Window* mouse_pressed_handler() { return mouse_pressed_handler_; }
   Window* capture_window() { return capture_window_; }
   ScreenAura* screen() { return screen_; }
+  void set_input_method(ui::InputMethod* input_method) {
+    input_method_ = input_method;  // does not own |input_method|.
+  }
+  ui::InputMethod* input_method() const { return input_method_; }
 
   void SetStackingClient(StackingClient* stacking_client);
 
@@ -236,6 +241,8 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   Window* focused_window_;
   Window* touch_event_handler_;
 
+  ui::InputMethod* input_method_;
+
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };