[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/chrome_launcher.cc

 // Copyright (c) 2013 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 "chrome/test/chromedriver/chrome_launcher.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 138 matching lines @@
     return status;
   switches.AppendToCommandLine(&command);
   *prepared_command = command;
   return Status(kOk);
 }
 
 Status WaitForDevToolsAndCheckVersion(
     const NetAddress& address,
     URLRequestContextGetter* context_getter,
     const SyncWebSocketFactory& socket_factory,
+    const Capabilities& capabilities,
     scoped_ptr<DevToolsHttpClient>* user_client) {
+  scoped_ptr<DeviceMetrics> device_metrics(
+      new DeviceMetrics(capabilities.device_metrics));
   scoped_ptr<DevToolsHttpClient> client(new DevToolsHttpClient(
-      address, context_getter, socket_factory));
+      address, context_getter, socket_factory, device_metrics.Pass()));
   base::TimeTicks deadline =
       base::TimeTicks::Now() + base::TimeDelta::FromSeconds(60);
   Status status = client->Init(deadline - base::TimeTicks::Now());
   if (status.IsError())
     return status;
   if (client->browser_info()->build_no < kMinimumSupportedChromeBuildNo) {
     return Status(kUnknownError, "Chrome version must be >= " +
         GetMinimumSupportedChromeVersion());
   }
 
@@ skipping 14 matching lines @@
 Status LaunchExistingChromeSession(
     URLRequestContextGetter* context_getter,
     const SyncWebSocketFactory& socket_factory,
     const Capabilities& capabilities,
     ScopedVector<DevToolsEventListener>& devtools_event_listeners,
     scoped_ptr<Chrome>* chrome) {
   Status status(kOk);
   scoped_ptr<DevToolsHttpClient> devtools_client;
   status = WaitForDevToolsAndCheckVersion(
       capabilities.debugger_address, context_getter, socket_factory,
-      &devtools_client);
+      capabilities, &devtools_client);

[stgao, 2014/05/14 05:10:14]

For this case "Existing Chrome Session", the browser is already launched, we
won't be able to set the command line switch "user-agent".

Maybe pass a NULL here.
In WaitForDevToolsAndCheckVersion check if it is NULL and do appropriate bailout
there.

[sam.rawlins, 2014/05/16 21:09:38]

Done.

   if (status.IsError()) {
     return Status(kUnknownError, "cannot connect to chrome at " +
                       capabilities.debugger_address.ToString(),
                   status);
   }
   chrome->reset(new ChromeExistingImpl(devtools_client.Pass(),
                                        devtools_event_listeners));
   return Status(kOk);
 }
 
@@ skipping 63 matching lines @@
 #else
   std::string command_string = command.GetCommandLineString();
 #endif
   VLOG(0) << "Launching chrome: " << command_string;
   base::ProcessHandle process;
   if (!base::LaunchProcess(command, options, &process))
     return Status(kUnknownError, "chrome failed to start");
 
   scoped_ptr<DevToolsHttpClient> devtools_client;
   status = WaitForDevToolsAndCheckVersion(
-      NetAddress(port), context_getter, socket_factory, &devtools_client);
+      NetAddress(port), context_getter, socket_factory, capabilities,
+      &devtools_client);
 
   if (status.IsError()) {
     int exit_code;
     base::TerminationStatus chrome_status =
         base::GetTerminationStatus(process, &exit_code);
     if (chrome_status != base::TERMINATION_STATUS_STILL_RUNNING) {
       std::string termination_reason;
       switch (chrome_status) {
         case base::TERMINATION_STATUS_NORMAL_TERMINATION:
           termination_reason = "exited normally";
@@ skipping 79 matching lines @@
                          port);
   if (status.IsError()) {
     device->TearDown();
     return status;
   }
 
   scoped_ptr<DevToolsHttpClient> devtools_client;
   status = WaitForDevToolsAndCheckVersion(NetAddress(port),
                                           context_getter,
                                           socket_factory,
+                                          capabilities,
                                           &devtools_client);
   if (status.IsError()) {
     device->TearDown();
     return status;
   }
 
   chrome->reset(new ChromeAndroidImpl(devtools_client.Pass(),
                                       devtools_event_listeners,
                                       port_reservation.Pass(),
                                       device.Pass()));
@@ skipping 295 matching lines @@
   // Write empty "First Run" file, otherwise Chrome will wipe the default
   // profile that was written.
   if (base::WriteFile(
           user_data_dir.Append(chrome::kFirstRunSentinel), "", 0) != 0) {
     return Status(kUnknownError, "failed to write first run file");
   }
   return Status(kOk);
 }
 
 }  // namespace internal