[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/chrome/chrome_impl.cc

Index: chrome/test/chromedriver/chrome/chrome_impl.cc
diff --git a/chrome/test/chromedriver/chrome/chrome_impl.cc b/chrome/test/chromedriver/chrome/chrome_impl.cc
index f0b87d653af8bf53d3b3f224e91f8bf8e1afbcee..5ac2f2bedb7e815dcd27a5bc990291f7ac8a3a34 100644
--- a/chrome/test/chromedriver/chrome/chrome_impl.cc
+++ b/chrome/test/chromedriver/chrome/chrome_impl.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/test/chromedriver/chrome/chrome_impl.h"
 
+#include "chrome/test/chromedriver/chrome/device_metrics.h"
 #include "chrome/test/chromedriver/chrome/devtools_client.h"
 #include "chrome/test/chromedriver/chrome/devtools_event_listener.h"
 #include "chrome/test/chromedriver/chrome/devtools_http_client.h"
@@ -83,7 +84,10 @@ Status ChromeImpl::GetWebViewIds(std::list<std::string>* web_view_ids) {
         // OnConnected will fire when DevToolsClient connects later.
       }
       web_views_.push_back(make_linked_ptr(new WebViewImpl(
-          view.id, devtools_http_client_->browser_info(), client.Pass())));
+          view.id,
+          devtools_http_client_->browser_info(),
+          client.Pass(),
+          device_metrics_.get())));
     }
   }
 
@@ -135,9 +139,11 @@ Status ChromeImpl::Quit() {
 ChromeImpl::ChromeImpl(
     scoped_ptr<DevToolsHttpClient> client,
     ScopedVector<DevToolsEventListener>& devtools_event_listeners,
-    scoped_ptr<PortReservation> port_reservation)
+    scoped_ptr<PortReservation> port_reservation,
+    scoped_ptr<DeviceMetrics> device_metrics)
     : quit_(false),
       devtools_http_client_(client.Pass()),
+      device_metrics_(device_metrics.Pass()),
       port_reservation_(port_reservation.Pass()) {
   devtools_event_listeners_.swap(devtools_event_listeners);
 }