DevTools: use explicit IPC messages for enabling/disabling tracing instead of intercepting protocol…

content/renderer/devtools/devtools_agent.cc

Index: content/renderer/devtools/devtools_agent.cc
diff --git a/content/renderer/devtools/devtools_agent.cc b/content/renderer/devtools/devtools_agent.cc
index 7cf467615263c8695db194c2664063da1489420d..71f55bbd3cdba7ab84cb3cf700fab4b258b7fdb0 100644
--- a/content/renderer/devtools/devtools_agent.cc
+++ b/content/renderer/devtools/devtools_agent.cc
@@ -171,6 +171,7 @@ void DevToolsAgent::setTraceEventCallback(const WebString& category_filter,
 }
 
 void DevToolsAgent::enableTracing(const WebString& category_filter) {
+  Send(new DevToolsHostMsg_EnableTracing(routing_id(), category_filter.utf8()));
   TraceLog* trace_log = TraceLog::GetInstance();
   trace_log->SetEnabled(base::debug::CategoryFilter(category_filter.utf8()),
                         TraceLog::RECORDING_MODE,
@@ -179,6 +180,7 @@ void DevToolsAgent::enableTracing(const WebString& category_filter) {
 
 void DevToolsAgent::disableTracing() {
   TraceLog::GetInstance()->SetDisabled();
+  Send(new DevToolsHostMsg_DisableTracing(routing_id()));
 }
 
 // static