Adds views::corewm::WMState to install common state

ui/views/corewm/transient_window_stacking_client.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/views/corewm/transient_window_stacking_client.h"
 
 #include <algorithm>
 
 using aura::Window;
 
@@ skipping 50 matching lines @@
 }
 
 }  // namespace
 
 TransientWindowStackingClient::TransientWindowStackingClient() {
 }
 
 TransientWindowStackingClient::~TransientWindowStackingClient() {
 }
 
-void TransientWindowStackingClient::AdjustStacking(
+bool TransientWindowStackingClient::AdjustStacking(
     Window** child,
     Window** target,
     Window::StackDirection* direction) {
   // For windows that have transient children stack the transient ancestors that
   // are siblings. This prevents one transient group from being inserted in the
   // middle of another.
   FindCommonTransientAncestor(child, target);
 
   // When stacking above skip to the topmost transient descendant of the target.
   if (*direction == Window::STACK_ABOVE &&
       !HasTransientAncestor(*child, *target)) {
     const Window::Windows& siblings((*child)->parent()->children());
     size_t target_i =
         std::find(siblings.begin(), siblings.end(), *target) - siblings.begin();
     while (target_i + 1 < siblings.size() &&
            HasTransientAncestor(siblings[target_i + 1], *target)) {
       ++target_i;
     }
     *target = siblings[target_i];
   }
+  return true;
 }
 
 }  // namespace corewm
 }  // namespace views