[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/chrome/chrome_desktop_impl.cc

Index: chrome/test/chromedriver/chrome/chrome_desktop_impl.cc
diff --git a/chrome/test/chromedriver/chrome/chrome_desktop_impl.cc b/chrome/test/chromedriver/chrome/chrome_desktop_impl.cc
index 8cdd130114b43668f60e315487e0c682c3a70c4a..6582d1c7a7c5031d68f065f21f177e639a33e1ec 100644
--- a/chrome/test/chromedriver/chrome/chrome_desktop_impl.cc
+++ b/chrome/test/chromedriver/chrome/chrome_desktop_impl.cc
@@ -12,6 +12,7 @@
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "chrome/test/chromedriver/chrome/automation_extension.h"
+#include "chrome/test/chromedriver/chrome/device_metrics.h"
 #include "chrome/test/chromedriver/chrome/devtools_client.h"
 #include "chrome/test/chromedriver/chrome/devtools_http_client.h"
 #include "chrome/test/chromedriver/chrome/status.h"
@@ -67,11 +68,13 @@ ChromeDesktopImpl::ChromeDesktopImpl(
     scoped_ptr<PortReservation> port_reservation,
     base::ProcessHandle process,
     const CommandLine& command,
+    scoped_ptr<DeviceMetrics> device_metrics,
     base::ScopedTempDir* user_data_dir,
     base::ScopedTempDir* extension_dir)
     : ChromeImpl(client.Pass(),
                  devtools_event_listeners,
-                 port_reservation.Pass()),
+                 port_reservation.Pass(),
+                 device_metrics.Pass()),
       process_(process),
       command_(command) {
   if (user_data_dir->IsValid())
@@ -117,7 +120,8 @@ Status ChromeDesktopImpl::WaitForPageToLoad(const std::string& url,
   scoped_ptr<WebView> web_view_tmp(
       new WebViewImpl(id,
                       devtools_http_client_->browser_info(),
-                      devtools_http_client_->CreateClient(id)));
+                      devtools_http_client_->CreateClient(id),
+                      device_metrics_.get()));
   Status status = web_view_tmp->ConnectIfNecessary();
   if (status.IsError())
     return status;