Switch primary display

chrome/browser/chromeos/display/display_preferences.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 "chrome/browser/chromeos/display/display_preferences.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/shell.h"
 #include "base/string16.h"
 #include "base/string_util.h"
@@ skipping 49 matching lines @@
                           int layout,
                           int offset) {
   {
     DictionaryPrefUpdate update(pref_service, prefs::kSecondaryDisplays);
     ash::DisplayLayout display_layout(
         static_cast<ash::DisplayLayout::Position>(layout), offset);
 
     aura::DisplayManager* display_manager =
         aura::Env::GetInstance()->display_manager();
     std::string name;
-    for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
-      if (display_manager->GetDisplayAt(i)->id() == display.id()) {
-        EscapeDisplayName(display_manager->GetDisplayNameAt(i), &name);
-        break;
-      }
-    }
-
+    EscapeDisplayName(display_manager->GetDisplayNameFor(display),
+                      &name);
     DCHECK(!name.empty());
 
     base::DictionaryValue* pref_data = update.Get();
     scoped_ptr<base::Value>layout_value(new base::DictionaryValue());
     if (pref_data->HasKey(name)) {
       base::Value* value = NULL;
       if (pref_data->Get(name, &value) && value != NULL)
         layout_value.reset(value->DeepCopy());
     }
     if (ash::DisplayLayout::ConvertToValue(display_layout, layout_value.get()))
@@ skipping 27 matching lines @@
     ash::DisplayLayout layout;
     if (!ash::DisplayLayout::ConvertFromValue(*value, &layout))
       continue;
 
     display_controller->SetLayoutForDisplayName(
         UnescapeDisplayName(*it), layout);
   }
 }
 
 }  // namespace chromeos