[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..7f796d2e653c0c415e2d472d9b6e088587028b00 100644
--- a/chrome/test/chromedriver/chrome/chrome_impl.cc
+++ b/chrome/test/chromedriver/chrome/chrome_impl.cc
@@ -83,7 +83,10 @@ 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(),
+          devtools_http_client_->device_metrics())));
     }
   }
 
@@ -125,6 +128,10 @@ Status ChromeImpl::ActivateWebView(const std::string& id) {
   return devtools_http_client_->ActivateWebView(id);
 }
 
+bool ChromeImpl::IsMobileEmulationEnabled() const {
+  return false;
+}
+
 Status ChromeImpl::Quit() {
   Status status = QuitImpl();
   if (status.IsOk())