Make IME extensions decide when to show the keyboard.

ui/keyboard/keyboard_controller.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/keyboard/keyboard_controller.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 288 matching lines @@
 void KeyboardController::ShowKeyboard(bool lock) {
   set_keyboard_locked(lock);
   ShowKeyboardInternal(display::kInvalidDisplayId);
 }
 
 void KeyboardController::ShowKeyboardInDisplay(int64_t display_id) {
   set_keyboard_locked(true);
   ShowKeyboardInternal(display_id);
 }
 
+bool KeyboardController::IsKeyboardWindowCreated() {
+  return keyboard_container_initialized() && ui_->HasKeyboardWindow();
+}
+
 void KeyboardController::OnWindowHierarchyChanged(
     const HierarchyChangeParams& params) {
   if (params.new_parent && params.target == container_.get())
     OnTextInputStateChanged(ui_->GetInputMethod()->GetTextInputClient());
 }
 
 void KeyboardController::OnWindowAddedToRootWindow(aura::Window* window) {
   if (!window->GetRootWindow()->HasObserver(this))
     window->GetRootWindow()->AddObserver(this);
 }
@@ skipping 182 matching lines @@
   ui_->EnsureCaretInWorkArea();
 }
 
 void KeyboardController::HideAnimationFinished() {
   ui_->HideKeyboardContainer(container_.get());
   for (KeyboardControllerObserver& observer : observer_list_)
     observer.OnKeyboardHidden();
 }
 
 }  // namespace keyboard