[ChromeDriver] Support mobile emulation on desktop Chrome.

chrome/test/chromedriver/chrome/device_metrics_override_manager.cc

Index: chrome/test/chromedriver/chrome/device_metrics_override_manager.cc
diff --git a/chrome/test/chromedriver/chrome/device_metrics_override_manager.cc b/chrome/test/chromedriver/chrome/device_metrics_override_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3dd62b73015b83a69e4793c8cba23d61d2900fcb
--- /dev/null
+++ b/chrome/test/chromedriver/chrome/device_metrics_override_manager.cc
@@ -0,0 +1,55 @@
+// 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/values.h"
+#include "chrome/test/chromedriver/chrome/device_metrics.h"
+#include "chrome/test/chromedriver/chrome/device_metrics_override_manager.h"
+#include "chrome/test/chromedriver/chrome/devtools_client.h"
+#include "chrome/test/chromedriver/chrome/status.h"
+
+DeviceMetricsOverrideManager::DeviceMetricsOverrideManager(
+    DevToolsClient* client, DeviceMetrics* device_metrics)
+    : client_(client), overridden_device_metrics_(device_metrics) {
+  if (overridden_device_metrics_->IsValid()) {

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

It is better to check "overridden_device_metrics_ == NULL" like you do below in
DeviceMetricsOverrideManager::ApplyOverrideIfNeeded.

And this will cause a segment fall in the case of "new WebViewImpl(*it,
&browser_info_, client.Pass(), NULL)".

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

Done.

+    client_->AddListener(this);
+  }

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

"{}" could be removed.

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

Done.

+}
+
+DeviceMetricsOverrideManager::~DeviceMetricsOverrideManager() {
+}
+
+Status DeviceMetricsOverrideManager::OnConnected(DevToolsClient* client) {
+  return ApplyOverrideIfNeeded();
+}
+
+Status DeviceMetricsOverrideManager::OnEvent(
+    DevToolsClient* client,
+    const std::string& method,
+    const base::DictionaryValue& params) {
+  if (method == "Page.frameNavigated") {
+    const base::Value* unused_value;
+    if (!params.Get("frame.parentId", &unused_value))
+      return ApplyOverrideIfNeeded();
+  }
+  return Status(kOk);
+}
+
+Status DeviceMetricsOverrideManager::ApplyOverrideIfNeeded() {
+  if (overridden_device_metrics_ == NULL)
+    return Status(kOk);
+
+  base::DictionaryValue params;
+  params.SetInteger("width", overridden_device_metrics_->width);
+  params.SetInteger("height", overridden_device_metrics_->height);
+  params.SetDouble("deviceScaleFactor",
+                   overridden_device_metrics_->device_scale_factor);
+  params.SetBoolean("emulateViewport",
+                    overridden_device_metrics_->emulate_viewport);
+  params.SetBoolean("fitWindow", overridden_device_metrics_->fit_window);
+  params.SetBoolean("textAutosizing",
+                    overridden_device_metrics_->text_autosizing);
+  params.SetDouble("fontScaleFactor",
+                   overridden_device_metrics_->font_scale_factor);
+  return client_->SendCommand("Page.setDeviceMetricsOverride", params);
+}