Use the source display's pixel size as a mirror window's size.

ash/system/chromeos/tray_display.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 "ash/system/chromeos/tray_display.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
@@ skipping 61 matching lines @@
 
   chromeos::OutputState InferOutputState() const {
     return Shell::GetScreen()->GetNumDisplays() == 1 ?
         chromeos::STATE_SINGLE : chromeos::STATE_DUAL_EXTENDED;
   }
 
  private:
   // Returns the name of the currently connected external display.
   base::string16 GetExternalDisplayName() const {
     DisplayManager* display_manager = Shell::GetInstance()->display_manager();
-    int64 external_id = display_manager->mirrored_display_id();
+    int64 external_id = display_manager->mirrored_display().id();
 
     if (external_id == gfx::Display::kInvalidDisplayID) {
       int64 internal_display_id = gfx::Display::InternalDisplayId();
       int64 first_display_id = display_manager->first_display_id();
       for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
         int64 id = display_manager->GetDisplayAt(i)->id();
         if (id != internal_display_id && id != first_display_id) {
           external_id = id;
           break;
         }
@@ skipping 67 matching lines @@
 
 #if defined(OS_CHROMEOS)
 void TrayDisplay::OnDisplayModeChanged() {
   if (default_)
     default_->Update();
 }
 #endif
 
 }  // namespace internal
 }  // namespace ash