ash: Start/stop observing KeyboardController via ShellObserver

ash/common/wm/lock_layout_manager.cc

 // Copyright 2014 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 "ash/common/wm/lock_layout_manager.h"
 
 #include "ash/common/wm/lock_window_state.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm/wm_event.h"
 #include "ash/common/wm_window.h"
@@ skipping 70 matching lines @@
 
 void LockLayoutManager::OnWindowBoundsChanged(aura::Window* window,
                                               const gfx::Rect& old_bounds,
                                               const gfx::Rect& new_bounds) {
   if (root_window_ == WmWindow::Get(window)) {
     const wm::WMEvent wm_event(wm::WM_EVENT_DISPLAY_BOUNDS_CHANGED);
     AdjustWindowsForWorkAreaChange(&wm_event);
   }
 }
 
-void LockLayoutManager::OnVirtualKeyboardStateChanged(bool activated) {
+void LockLayoutManager::OnVirtualKeyboardStateChanged(bool activated,
+                                                      WmWindow* root_window) {
   if (keyboard::KeyboardController::GetInstance()) {
     if (activated) {
       if (!is_observing_keyboard_) {
         keyboard::KeyboardController::GetInstance()->AddObserver(this);
         is_observing_keyboard_ = true;
       }
     } else {
       keyboard::KeyboardController::GetInstance()->RemoveObserver(this);
       is_observing_keyboard_ = false;
     }
@@ skipping 10 matching lines @@
 void LockLayoutManager::AdjustWindowsForWorkAreaChange(
     const wm::WMEvent* event) {
   DCHECK(event->type() == wm::WM_EVENT_DISPLAY_BOUNDS_CHANGED ||
          event->type() == wm::WM_EVENT_WORKAREA_BOUNDS_CHANGED);
 
   for (WmWindow* child : window_->GetChildren())
     child->GetWindowState()->OnWMEvent(event);
 }
 
 }  // namespace ash