[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/capabilities.h

Index: chrome/test/chromedriver/capabilities.h
diff --git a/chrome/test/chromedriver/capabilities.h b/chrome/test/chromedriver/capabilities.h
index 998c56aed19f08aa454700c9ea970ea90d1bbf32..953947786b8642a9e568ca983cd5278e02b87f0f 100644
--- a/chrome/test/chromedriver/capabilities.h
+++ b/chrome/test/chromedriver/capabilities.h
@@ -14,6 +14,7 @@
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
+#include "chrome/test/chromedriver/chrome/device_metrics.h"
 #include "chrome/test/chromedriver/chrome/log.h"
 #include "chrome/test/chromedriver/net/net_util.h"
 
@@ -91,6 +92,9 @@ struct Capabilities {
   // ChromeDriver dies.
   bool detach;
 
+  // Device metrics for use in Device Emulation.
+  DeviceMetrics device_metrics;

[stgao, 2014/05/14 05:10:14]

We could wrap this into a scoped_ptr like the |local_state| below.

[sam.rawlins, 2014/05/16 21:09:38]

Done.

+
   // Set of switches which should be removed from default list when launching
   // Chrome.
   std::set<std::string> exclude_switches;