Make IME extensions decide when to show the keyboard.

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 2ca8880b4b30d7b4bad60a0b2dd28682d0b84e6a..817fa0d0f2752036a43b59ab9eb632b880b2cc78 100644
--- a/ui/keyboard/keyboard_controller.h
+++ b/ui/keyboard/keyboard_controller.h
@@ -117,6 +117,9 @@ class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
 
   bool show_on_resize() { return show_on_resize_; }
 
+  // Returns true if keyboard window has been created.
+  bool IsKeyboardWindowCreated();
+
   // Returns the current keyboard bounds. An empty rectangle will get returned
   // when the keyboard is not shown or in FLOATING mode.
   const gfx::Rect& current_keyboard_bounds() {