[chromedriver] Implement connecting to devtools and loading a page.

chrome/test/chromedriver/devtools_client.cc

+// Copyright (c) 2012 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/devtools_client.h"
+
+#include "base/json/json_writer.h"
+#include "base/values.h"
+#include "chrome/test/chromedriver/net/sync_websocket.h"
+#include "chrome/test/chromedriver/net/url_request_context_getter.h"
+#include "chrome/test/chromedriver/status.h"
+#include "googleurl/src/gurl.h"
+
+DevToolsClient::DevToolsClient(
+    URLRequestContextGetter* context_getter,
+    const std::string& url)
+    : context_getter_(context_getter),
+      url_(url),
+      socket_(new SyncWebSocket(context_getter)),
+      connected_(false) {}
+
+DevToolsClient::~DevToolsClient() {}
+
+Status DevToolsClient::SendCommand(
+    const std::string& method,
+    const base::DictionaryValue& params) {
+  if (!connected_) {
+    if (!socket_->Connect(GURL(url_)))
+      return Status(kUnknownError, "unable to connect to renderer");
+    connected_ = true;
+  }
+  base::DictionaryValue command;
+  command.SetInteger("id", 1);
+  command.SetString("method", method);
+  command.Set("params", params.DeepCopy());
+  std::string message;
+  base::JSONWriter::Write(&command, &message);
+  if (!socket_->Send(message))
+    return Status(kUnknownError, "unable to send message to renderer");
+  std::string response;
+  if (!socket_->ReceiveNextMessage(&response))
+    return Status(kUnknownError, "unable to receive message from renderer");
+  return Status(kOk);
+}