Use persistent ID/names for displays.

ui/aura/single_display_manager.cc

 // Copyright (c) 2012 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/aura/single_display_manager.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "ui/aura/aura_switches.h"
@@ skipping 59 matching lines @@
 const gfx::Display& SingleDisplayManager::GetDisplayNearestPoint(
     const gfx::Point& point) const {
   return display_;
 }
 
 const gfx::Display& SingleDisplayManager::GetDisplayMatching(
     const gfx::Rect& match_rect) const {
   return display_;
 }
 
+std::string SingleDisplayManager::GetDisplayNameAt(size_t index) {
+  return "Display";
+}
+
 void SingleDisplayManager::OnWindowBoundsChanged(
     Window* window, const gfx::Rect& old_bounds, const gfx::Rect& new_bounds) {
   if (!use_fullscreen_host_window()) {
     Update(new_bounds.size());
     NotifyBoundsChanged(display_);
   }
 }
 
 void SingleDisplayManager::OnWindowDestroying(Window* window) {
   if (root_window_ == window)
     root_window_ = NULL;
 }
 
 void SingleDisplayManager::Init() {
   const string size_str = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
       switches::kAuraHostWindowSize);
   display_ = CreateDisplayFromSpec(size_str);
 }
 
 void SingleDisplayManager::Update(const gfx::Size size) {
   display_.SetSize(size);
 }
 
 }  // namespace aura