Allow javascript change the virtual keyboard window size and position freely in FLOATING mode

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 d81bedaf6c2b996cf8f659aeaf59b4f80afd3a81..53da81a61301757e936fde18dd5822273f3551a7 100644
--- a/ui/keyboard/keyboard_controller.h
+++ b/ui/keyboard/keyboard_controller.h
@@ -92,6 +92,8 @@ class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
 
   void set_lock_keyboard(bool lock) { lock_keyboard_ = lock; }
 
+  KeyboardMode keyboard_mode() const { return keyboard_mode_; }
+
   void SetKeyboardMode(KeyboardMode mode);
 
   // Force the keyboard to show up if not showing and lock the keyboard if
@@ -129,6 +131,12 @@ class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
 
   // aura::WindowObserver overrides
   void OnWindowHierarchyChanged(const HierarchyChangeParams& params) override;
+  void OnWindowAddedToRootWindow(aura::Window* window) override;
+  void OnWindowRemovingFromRootWindow(aura::Window* window,
+                                      aura::Window* new_root) override;
+  void OnWindowBoundsChanged(aura::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
 
   // InputMethodObserver overrides
   void OnTextInputTypeChanged(const ui::TextInputClient* client) override {}