[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/chrome/devtools_http_client.cc

Index: chrome/test/chromedriver/chrome/devtools_http_client.cc
diff --git a/chrome/test/chromedriver/chrome/devtools_http_client.cc b/chrome/test/chromedriver/chrome/devtools_http_client.cc
index 2d380a8490ba2b4a581591b06d779e8b079ca2ff..15a4d5965df3b76efaf27926cc996ffe6c9b97f1 100644
--- a/chrome/test/chromedriver/chrome/devtools_http_client.cc
+++ b/chrome/test/chromedriver/chrome/devtools_http_client.cc
@@ -13,6 +13,7 @@
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "base/values.h"
+#include "chrome/test/chromedriver/chrome/device_metrics.h"
 #include "chrome/test/chromedriver/chrome/devtools_client_impl.h"
 #include "chrome/test/chromedriver/chrome/log.h"
 #include "chrome/test/chromedriver/chrome/status.h"
@@ -67,8 +68,10 @@ const WebViewInfo* WebViewsInfo::GetForId(const std::string& id) const {
 DevToolsHttpClient::DevToolsHttpClient(
     const NetAddress& address,
     scoped_refptr<URLRequestContextGetter> context_getter,
-    const SyncWebSocketFactory& socket_factory)
-    : context_getter_(context_getter),
+    const SyncWebSocketFactory& socket_factory,
+    scoped_ptr<DeviceMetrics> device_metrics)
+    : device_metrics_(device_metrics.Pass()),
+      context_getter_(context_getter),
       socket_factory_(socket_factory),
       server_url_("http://" + address.ToString()),
       web_socket_url_prefix_(base::StringPrintf(
@@ -248,7 +251,7 @@ Status DevToolsHttpClient::CloseFrontends(const std::string& for_client_id) {
         *it,
         base::Bind(&FakeCloseFrontends)));
     scoped_ptr<WebViewImpl> web_view(
-        new WebViewImpl(*it, &browser_info_, client.Pass()));
+        new WebViewImpl(*it, &browser_info_, client.Pass(), NULL));
 
     status = web_view->ConnectIfNecessary();
     // Ignore disconnected error, because the debugger might have closed when