DevTools: handle Tracing.start in both browser and renderer

content/browser/devtools/devtools_http_handler_impl.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_http_handler_impl.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 309 matching lines @@
   std::string browser_prefix = "/devtools/browser";
   size_t browser_pos = request.path.find(browser_prefix);
   if (browser_pos == 0) {
     if (browser_target_) {
       server_->Send500(connection_id, "Another client already attached");
       return;
     }
     browser_target_ = new DevToolsBrowserTarget(server_.get(), connection_id);
     browser_target_->RegisterDomainHandler(
         devtools::Tracing::kName,
-        new DevToolsTracingHandler(),
+        new DevToolsTracingHandler(DevToolsTracingHandler::Browser),
         true /* handle on UI thread */);
     browser_target_->RegisterDomainHandler(
         TetheringHandler::kDomain,
         new TetheringHandler(delegate_.get()),
         false /* handle on this thread */);
     browser_target_->RegisterDomainHandler(
         devtools::SystemInfo::kName,
         new DevToolsSystemInfoHandler(),
         true /* handle on UI thread */);
 
@@ skipping 439 matching lines @@
         id.c_str(),
         host);
     dictionary->SetString(
         kTargetDevtoolsFrontendUrlField, devtools_frontend_url);
   }
 
   return dictionary;
 }
 
 }  // namespace content