Add popup layout tests with device scale factor

content/shell/app/shell_main_delegate.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 "content/shell/app/shell_main_delegate.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/cpu.h"
 #include "base/files/file.h"
@@ skipping 152 matching lines @@
     command_line.AppendSwitch(switches::kEnableLogging);
     command_line.AppendSwitch(switches::kAllowFileAccessFromFiles);
     // only default to osmesa if the flag isn't already specified.
     if (!command_line.HasSwitch(switches::kUseGL)) {
       command_line.AppendSwitchASCII(switches::kUseGL,
                                      gfx::kGLImplementationOSMesaName);
     }
     command_line.AppendSwitch(switches::kSkipGpuDataLoading);
     command_line.AppendSwitchASCII(switches::kTouchEvents,
                                    switches::kTouchEventsEnabled);
-    command_line.AppendSwitchASCII(switches::kForceDeviceScaleFactor, "1.0");
+    if (!command_line.HasSwitch(switches::kForceDeviceScaleFactor))
+      command_line.AppendSwitchASCII(switches::kForceDeviceScaleFactor, "1.0");
     command_line.AppendSwitch(
         switches::kDisableGestureRequirementForMediaPlayback);
 
     if (!command_line.HasSwitch(switches::kStableReleaseMode)) {
       command_line.AppendSwitch(
         switches::kEnableExperimentalWebPlatformFeatures);
       // Only enable WebBluetooth during Layout Tests in non release mode.
       command_line.AppendSwitch(switches::kEnableWebBluetooth);
     }
 
@@ skipping 167 matching lines @@
 
   return renderer_client_.get();
 }
 
 ContentUtilityClient* ShellMainDelegate::CreateContentUtilityClient() {
   utility_client_.reset(new ShellContentUtilityClient);
   return utility_client_.get();
 }
 
 }  // namespace content