Introduce intercepting and handling devtools messages in the renderer.

content/browser/devtools/devtools_tracing_handler.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 "content/browser/devtools/devtools_tracing_handler.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/json/json_writer.h"
 #include "base/location.h"
@@ skipping 11 matching lines @@
 const char kTracingStartCommand[] = "Tracing.start";
 const char kTracingEndCommand[] = "Tracing.end";
 
 const char kTracingCompleteNotification[] = "Tracing.tracingComplete";
 const char kTracingDataCollected[] = "Tracing.dataCollected";
 
 const char kCategoriesParam[] = "categories";
 
 }  // namespace
 
-DevToolsTracingHandler::DevToolsTracingHandler()
-    : DevToolsBrowserTarget::DomainHandler(kTracingDomain),
+DevToolsTracingHandler::DevToolsTracingHandler(
+    const DevToolsProtocol::Notifier& notifier)
+    : DevToolsBrowserTarget::DomainHandler(notifier, kTracingDomain),
       is_running_(false) {
   RegisterCommandHandler(kTracingStartCommand,
                          base::Bind(&DevToolsTracingHandler::OnStart,
                                     base::Unretained(this)));
   RegisterCommandHandler(kTracingEndCommand,
                          base::Bind(&DevToolsTracingHandler::OnEnd,
                                     base::Unretained(this)));
 }
 
 DevToolsTracingHandler::~DevToolsTracingHandler() {
@@ skipping 25 matching lines @@
 }
 
 
 scoped_ptr<DevToolsProtocol::Response>
 DevToolsTracingHandler::OnEnd(DevToolsProtocol::Command* command) {
   TraceController::GetInstance()->EndTracingAsync(this);
   return command->SuccessResponse(NULL);
 }
 
 }  // namespace content