Get the default device scale factor from monitor

ash/monitor/multi_monitor_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/monitor/multi_monitor_manager.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 151 matching lines @@
 }
 
 void MultiMonitorManager::Init() {
   // TODO(oshima): Move this logic to MonitorChangeObserver.
   const string size_str = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
       switches::kAuraHostWindowSize);
   vector<string> parts;
   base::SplitString(size_str, ',', &parts);
   for (vector<string>::const_iterator iter = parts.begin();
        iter != parts.end(); ++iter) {
-    monitors_.push_back(CreateMonitorFromSpec(*iter));
+    monitors_.push_back(CreateMonitorFromSpec(
+        default_device_scale_factor(), *iter));
   }
   if (monitors_.empty())
-    monitors_.push_back(CreateMonitorFromSpec("" /* default */));
+    monitors_.push_back(CreateMonitorFromSpec(
+        default_device_scale_factor(), "" /* default */));
 }
 
 void MultiMonitorManager::AddRemoveMonitorImpl() {
   std::vector<Monitor> new_monitors;
   if (monitors_.size() > 1) {
     // Remove if there is more than one monitor.
     int count = monitors_.size() - 1;
     for (Monitors::const_iterator iter = monitors_.begin(); count-- > 0; ++iter)
       new_monitors.push_back(*iter);
   } else {
     // Add if there is only one monitor.
     new_monitors.push_back(monitors_[0]);
-    new_monitors.push_back(CreateMonitorFromSpec("50+50-1280x768"));
+    new_monitors.push_back(CreateMonitorFromSpec(
+        default_device_scale_factor(), "50+50-1280x768"));
   }
   if (new_monitors.size())
     OnNativeMonitorsChanged(new_monitors);
 }
 
 void MultiMonitorManager::CycleMonitorImpl() {
   if (monitors_.size() > 1) {
     std::vector<Monitor> new_monitors;
     for (Monitors::const_iterator iter = monitors_.begin() + 1;
          iter != monitors_.end(); ++iter) {
@@ skipping 10 matching lines @@
        iter != monitors_.end(); ++iter) {
     if ((*iter).id() == id)
       return *iter;
   }
   DLOG(FATAL) << "Could not find monitor by id:" << id;
   return GetInvalidMonitor();
 }
 
 }  // namespace internal
 }  // namespace ash