A couple of multiple displays support fixes.

ash/display/multi_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 "ash/display/multi_display_manager.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/display/display_controller.h"
@@ skipping 260 matching lines @@
   DLOG(FATAL) << "Could not find display by id:" << id;
   return GetInvalidDisplay();
 }
 
 void MultiDisplayManager::AddDisplayFromSpec(const std::string& spec) {
   gfx::Display display = CreateDisplayFromSpec(spec);
 
   if (DisplayController::IsExtendedDesktopEnabled()) {
     const gfx::Insets insets = display.GetWorkAreaInsets();
     const gfx::Rect& native_bounds = display.bounds_in_pixel();
-    display.set_bounds(
-        gfx::Rect(native_bounds.origin(), display.bounds().size()));
+    display.SetScaleAndBounds(display.device_scale_factor(), native_bounds);
     display.UpdateWorkAreaFromInsets(insets);
   }
   displays_.push_back(display);
 }
 
 }  // namespace internal
 }  // namespace ash