[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/capabilities.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/capabilities.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 66 matching lines @@
 Status IgnoreCapability(const base::Value& option, Capabilities* capabilities) {
   return Status(kOk);
 }
 
 Status ParseLogPath(const base::Value& option, Capabilities* capabilities) {
   if (!option.GetAsString(&capabilities->log_path))
     return Status(kUnknownError, "must be a string");
   return Status(kOk);
 }
 
+Status ParseDeviceMetrics(const base::Value& option,
+                     Capabilities* capabilities) {
+  const base::DictionaryValue* metrics;
+  if (!option.GetAsDictionary(&metrics))
+    return Status(kUnknownError, "must be a dictionary");
+
+  if (!metrics->GetInteger("width", &(capabilities->device_metrics.width)) ||

[stgao, 2014/04/30 03:32:55]

Code in chromedriver seems not to use "()" to wrap the variable like
"capabilities->device_metrics.width". Maybe remove it if no compile error
occurs?

Same for the two below.

+      !metrics->GetInteger("height", &(capabilities->device_metrics.height)) ||
+      !metrics->GetDouble("pixel_ratio", &(capabilities->device_metrics.device_scale_factor)))

[stgao, 2014/04/30 03:32:55]

over 80 chars.

+    return Status(kUnknownError, "missing or invalid 'metrics'");
+
+  capabilities->device_metrics.emulate_viewport = false;
+  capabilities->device_metrics.fit_window = true;
+  capabilities->device_metrics.text_autosizing = true;
+  capabilities->device_metrics.font_scale_factor = 1;
+
+  return Status(kOk);
+}
+
 Status ParseSwitches(const base::Value& option,
                      Capabilities* capabilities) {
   const base::ListValue* switches_list = NULL;
   if (!option.GetAsList(&switches_list))
     return Status(kUnknownError, "must be a list");
   for (size_t i = 0; i < switches_list->GetSize(); ++i) {
     std::string arg_string;
     if (!switches_list->GetString(i, &arg_string))
       return Status(kUnknownError, "each argument must be a string");
     capabilities->switches.SetUnparsedSwitch(arg_string);
@@ skipping 168 matching lines @@
     parser_map["androidUseRunningApp"] =
         base::Bind(&ParseBoolean, &capabilities->android_use_running_app);
     parser_map["args"] = base::Bind(&ParseSwitches);
     parser_map["loadAsync"] = base::Bind(&IgnoreDeprecatedOption, "loadAsync");
   } else if (is_existing) {
     parser_map["debuggerAddress"] = base::Bind(&ParseUseExistingBrowser);
   } else {
     parser_map["args"] = base::Bind(&ParseSwitches);
     parser_map["binary"] = base::Bind(&ParseFilePath, &capabilities->binary);
     parser_map["detach"] = base::Bind(&ParseBoolean, &capabilities->detach);
+    parser_map["deviceMetrics"] =
+        base::Bind(&ParseDeviceMetrics);
     parser_map["excludeSwitches"] = base::Bind(&ParseExcludeSwitches);
     parser_map["extensions"] = base::Bind(&ParseExtensions);
     parser_map["forceDevToolsScreenshot"] = base::Bind(
         &ParseBoolean, &capabilities->force_devtools_screenshot);
     parser_map["loadAsync"] = base::Bind(&IgnoreDeprecatedOption, "loadAsync");
     parser_map["localState"] =
         base::Bind(&ParseDict, &capabilities->local_state);
     parser_map["logPath"] = base::Bind(&ParseLogPath);
     parser_map["minidumpPath"] =
         base::Bind(&ParseString, &capabilities->minidump_path);
@@ skipping 148 matching lines @@
     if (desired_caps.Get(it->first, &capability)) {
       Status status = it->second.Run(*capability, this);
       if (status.IsError()) {
         return Status(
             kUnknownError, "cannot parse capability: " + it->first, status);
       }
     }
   }
   return Status(kOk);
 }