[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/mobile_device.cc

+// Copyright (c) 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/json/json_reader.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/values.h"
+#include "chrome/test/chromedriver/chrome/mobile_devices.h"
+#include "chrome/test/chromedriver/chrome/status.h"
+#include "chrome/test/chromedriver/mobile_device.h"
+
+MobileDevice::MobileDevice() {}
+MobileDevice::MobileDevice(DeviceMetrics device_metrics, std::string user_agent)
+  : device_metrics(device_metrics), user_agent(user_agent) {}
+MobileDevice::~MobileDevice() {}
+
+Status FindMobileDevice(std::string device_name,
+                        scoped_ptr<MobileDevice>* mobile_device) {
+  base::JSONReader json_reader(base::JSON_ALLOW_TRAILING_COMMAS);
+  scoped_ptr<base::Value> devices_value;
+  devices_value.reset(json_reader.ReadToValue(kMobileDevices));
+  if (!devices_value.get())
+    return Status(kUnknownError,
+                  "Could not parse mobile device list because " +

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

lowercase for error message. "Could" -> "could".

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

Done.

+                  json_reader.GetErrorMessage());
+
+  base::ListValue* mobile_devices;
+  if (!devices_value->GetAsList(&mobile_devices))
+    return Status(kUnknownError, "malformed device metrics list");
+
+  for (base::ListValue::iterator it = mobile_devices->begin();
+       it != mobile_devices->end();
+       ++it) {
+    base::ListValue* device = NULL;
+    (*it)->GetAsList(&device);

[samuong, 2014/05/09 17:58:54]

GetAsList, as well as GetString, StringToInt and StringToDouble below, all
return a bool which we should be checking for.

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

Done.

+    if (device != NULL) {
+      std::string name;
+      device->GetString(0, &name);
+      if (name != device_name)
+        continue;
+
+      scoped_ptr<MobileDevice> tmp_mobile_device(new MobileDevice());
+      std::string device_metrics_string;
+      device->GetString(1, &tmp_mobile_device->user_agent);
+      device->GetString(2, &device_metrics_string);
+      std::vector<std::string> metrics_vector;
+      base::SplitString(device_metrics_string, 'x', &metrics_vector);
+      if (metrics_vector.size() < 3)
+        return Status(kUnknownError, "malformed device metrics string");
+
+      int width = 0;
+      int height = 0;
+      double device_scale_factor = 0.0;
+      base::StringToInt(metrics_vector[0], &width);
+      base::StringToInt(metrics_vector[1], &height);
+      base::StringToDouble(metrics_vector[2], &device_scale_factor);
+      tmp_mobile_device->device_metrics =
+          DeviceMetrics(width, height, device_scale_factor);
+
+      *mobile_device = tmp_mobile_device.Pass();
+      return Status(kOk);
+    }
+  }
+
+  return Status(kUnknownError, "must be a valid device");
+}