Simplify VirtualKeyboardTray

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 251 matching lines @@
 }
 
 void KeyboardController::AddObserver(KeyboardControllerObserver* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void KeyboardController::RemoveObserver(KeyboardControllerObserver* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
+bool KeyboardController::HasObserver(
+    KeyboardControllerObserver* observer) const {
+  return observer_list_.HasObserver(observer);
+}
+
 void KeyboardController::SetKeyboardMode(KeyboardMode mode) {
   if (keyboard_mode_ == mode)
     return;
 
   keyboard_mode_ = mode;
   // When keyboard is floating, no overscroll or resize is necessary. Sets
   // keyboard bounds to zero so overscroll or resize is disabled.
   if (keyboard_mode_ == FLOATING) {
     NotifyKeyboardBoundsChanging(gfx::Rect());
   } else if (keyboard_mode_ == FULL_WIDTH) {
@@ skipping 200 matching lines @@
   // background during animation.
   NotifyKeyboardBoundsChanging(container_->bounds());
   ui_->EnsureCaretInWorkArea();
 }
 
 void KeyboardController::HideAnimationFinished() {
   ui_->HideKeyboardContainer(container_.get());
 }
 
 }  // namespace keyboard