Get the default device scale factor from monitor

ash/monitor/multi_monitor_manager_unittest.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 "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "base/format_macros.h"
 #include "base/string_split.h"
@@ skipping 13 matching lines @@
 
 namespace {
 
 vector<Monitor> CreateMonitorsFromString(
     const std::string specs) {
   vector<Monitor> monitors;
   vector<string> parts;
   base::SplitString(specs, ',', &parts);
   for (vector<string>::const_iterator iter = parts.begin();
        iter != parts.end(); ++iter) {
-    monitors.push_back(aura::MonitorManager::CreateMonitorFromSpec(*iter));
+    monitors.push_back(
+        aura::MonitorManager::CreateMonitorFromSpec(1.0f, *iter));
   }
   return monitors;
 }
 
 }  // namespace
 
 class MultiMonitorManagerTest : public test::AshTestBase,
                                 public aura::MonitorObserver,
                                 public aura::WindowObserver {
  public:
@@ skipping 182 matching lines @@
   reset();
 
   internal::MultiMonitorManager::CycleMonitor();
   EXPECT_EQ(1U, monitor_manager()->GetNumMonitors());
   EXPECT_EQ("0 0 0", GetCountSummary());
   reset();
 }
 
 }  // namespace test
 }  // namespace ash