[Chromedriver] Add Device Metrics override support to ChromeDriver via Capabilities

chrome/test/chromedriver/chrome/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_device.h"
+#include "chrome/test/chromedriver/chrome/mobile_device_list.h"
+#include "chrome/test/chromedriver/chrome/status.h"
+
+MobileDevice::MobileDevice() {}
+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 " +
+                  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;
+    if (!(*it)->GetAsList(&device)) {
+      return Status(kUnknownError,
+                    "malformed device in list: should be an array");
+    }
+
+    if (device != NULL) {
+      std::string name;
+      if (!device->GetString(0, &name)) {
+        return Status(kUnknownError,
+                      "malformed device name: should be a string");
+      }
+      if (name != device_name)
+        continue;
+
+      scoped_ptr<MobileDevice> tmp_mobile_device(new MobileDevice());
+      std::string device_metrics_string;
+      if (!device->GetString(1, &tmp_mobile_device->user_agent)) {
+        return Status(kUnknownError,
+                      "malformed device user agent: should be a string");
+      }
+      if (!device->GetString(2, &device_metrics_string)) {
+        return Status(kUnknownError,
+                      "malformed device metrics: should be a 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;
+      if (!base::StringToInt(metrics_vector[0], &width)) {
+        return Status(kUnknownError,
+                      "malformed device width: should be an integer");
+      }
+      if (!base::StringToInt(metrics_vector[1], &height)) {
+        return Status(kUnknownError,
+                      "malformed device height: should be an integer");
+      }
+      if (!base::StringToDouble(metrics_vector[2], &device_scale_factor)) {
+        return Status(kUnknownError,
+                      "malformed device scale factor: should be a double");
+      }
+      tmp_mobile_device->device_metrics.reset(
+          new DeviceMetrics(width, height, device_scale_factor));
+
+      *mobile_device = tmp_mobile_device.Pass();
+      return Status(kOk);
+    }
+  }
+
+  return Status(kUnknownError, "must be a valid device");
+}