Use devtools to set user agent in chromedriver

chrome/test/chromedriver/chrome/mobile_emulation_override_manager_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/values.h"
 #include "chrome/test/chromedriver/chrome/device_metrics.h"
 #include "chrome/test/chromedriver/chrome/mobile_emulation_override_manager.h"
 #include "chrome/test/chromedriver/chrome/recorder_devtools_client.h"
 #include "chrome/test/chromedriver/chrome/status.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 21 matching lines @@
   ASSERT_EQ(device_metrics.fit_window, fit_window);
   ASSERT_EQ(device_metrics.text_autosizing, text_autosizing);
   ASSERT_EQ(device_metrics.font_scale_factor, font_scale_factor);
 }
 
 }  // namespace
 
 TEST(MobileEmulationOverrideManager, SendsCommandWithTouchOnConnect) {
   RecorderDevToolsClient client;
   DeviceMetrics device_metrics(1, 2, 3.0, true, true);
-  MobileEmulationOverrideManager manager(&client, &device_metrics);
+  MobileEmulationOverrideManager manager(&client, &device_metrics,
+                                         std::string());
   ASSERT_EQ(0u, client.commands_.size());
   ASSERT_EQ(kOk, manager.OnConnected(&client).code());
 
   ASSERT_EQ(2u, client.commands_.size());
   ASSERT_EQ(kOk, manager.OnConnected(&client).code());
   ASSERT_EQ(4u, client.commands_.size());
   ASSERT_NO_FATAL_FAILURE(
       AssertDeviceMetricsCommand(client.commands_[2], device_metrics));
 }
 
 TEST(MobileEmulationOverrideManager, SendsCommandWithoutTouchOnConnect) {
   RecorderDevToolsClient client;
   DeviceMetrics device_metrics(1, 2, 3.0, false, true);
-  MobileEmulationOverrideManager manager(&client, &device_metrics);
+  MobileEmulationOverrideManager manager(&client, &device_metrics,
+                                         std::string());
   ASSERT_EQ(0u, client.commands_.size());
   ASSERT_EQ(kOk, manager.OnConnected(&client).code());
 
   ASSERT_EQ(1u, client.commands_.size());
   ASSERT_EQ(kOk, manager.OnConnected(&client).code());
   ASSERT_EQ(2u, client.commands_.size());
   ASSERT_NO_FATAL_FAILURE(
       AssertDeviceMetricsCommand(client.commands_[1], device_metrics));
 }
 
 TEST(MobileEmulationOverrideManager, SendsCommandOnNavigation) {
   RecorderDevToolsClient client;
   DeviceMetrics device_metrics(1, 2, 3.0, true, true);
-  MobileEmulationOverrideManager manager(&client, &device_metrics);
+  MobileEmulationOverrideManager manager(&client, &device_metrics,
+                                         std::string());
   base::DictionaryValue main_frame_params;
   ASSERT_EQ(kOk,
             manager.OnEvent(&client, "Page.frameNavigated", main_frame_params)
                 .code());
   ASSERT_EQ(2u, client.commands_.size());
   ASSERT_EQ(kOk,
             manager.OnEvent(&client, "Page.frameNavigated", main_frame_params)
                 .code());
   ASSERT_EQ(4u, client.commands_.size());
   ASSERT_NO_FATAL_FAILURE(
       AssertDeviceMetricsCommand(client.commands_[2], device_metrics));
 
   base::DictionaryValue sub_frame_params;
   sub_frame_params.SetString("frame.parentId", "id");
   ASSERT_EQ(
       kOk,
       manager.OnEvent(&client, "Page.frameNavigated", sub_frame_params).code());
   ASSERT_EQ(4u, client.commands_.size());
 }