Introduce intercepting and handling devtools messages in the renderer.

content/browser/devtools/devtools_protocol.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 "content/browser/devtools/devtools_protocol.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 
 namespace content {
@@ skipping 100 matching lines @@
   base::DictionaryValue notification;
   notification.SetString("method", method_);
   if (params_.get())
     notification.Set("params", params_->DeepCopy());
 
   std::string json_notification;
   base::JSONWriter::Write(&notification, &json_notification);
   return json_notification;
 }
 
+DevToolsProtocol::Handler::~Handler() {
+}
+
+scoped_ptr<DevToolsProtocol::Response>
+DevToolsProtocol::Handler::HandleCommand(
+    DevToolsProtocol::Command* command) {
+  CommandHandlers::iterator it = command_handlers_.find(command->method());
+  if (it == command_handlers_.end())
+    return scoped_ptr<DevToolsProtocol::Response>();
+  return (it->second).Run(command);
+}
+
+void DevToolsProtocol::Handler::SetNotifier(const Notifier& notifier) {
+  notifier_ = notifier;
+}
+
+DevToolsProtocol::Handler::Handler() {
+}
+
+void DevToolsProtocol::Handler::RegisterCommandHandler(
+    const std::string& command,
+    const CommandHandler& handler) {
+  command_handlers_[command] = handler;
+}
+
+void DevToolsProtocol::Handler::SendNotification(
+    const std::string& method,
+    base::DictionaryValue* params) {
+  DevToolsProtocol::Notification notification(method, params);
+  if (!notifier_.is_null())
+    notifier_.Run(notification.Serialize());
+}
+
 // static
 DevToolsProtocol::Command* DevToolsProtocol::ParseCommand(
     const std::string& json,
     std::string* error_response) {
   int parse_error_code;
   std::string error_message;
   scoped_ptr<base::Value> command(
       base::JSONReader::ReadAndReturnError(
           json, 0, &parse_error_code, &error_message));
 
@@ skipping 26 matching lines @@
   }
 
   std::string domain = method.substr(0, pos);
 
   base::DictionaryValue* params = NULL;
   command_dict->GetDictionary("params", &params);
   return new Command(id, domain, method, params ? params->DeepCopy() : NULL);
 }
 
 }  // namespace content