Use disabled-by-default prefix in logging NetLog events to TraceLog

net/base/trace_net_log_observer.cc

Index: net/base/trace_net_log_observer.cc
diff --git a/net/base/trace_net_log_observer.cc b/net/base/trace_net_log_observer.cc
index 15960c3b43d674290b228b5296847ed337ce1f4a..d5724bea5b18c44198e812506b5b9f1395f9afeb 100644
--- a/net/base/trace_net_log_observer.cc
+++ b/net/base/trace_net_log_observer.cc
@@ -40,6 +40,9 @@ class TracedValue : public base::debug::ConvertableToTraceFormat {
   scoped_ptr<base::Value> value_;
 };
 
+// TraceLog category for NetLog events.
+const char kNetLogTracingCategory[] = "disabled-by-default-netlog";
+
 }  // namespace
 
 TraceNetLogObserver::TraceNetLogObserver() : net_log_to_watch_(NULL) {
@@ -55,21 +58,24 @@ void TraceNetLogObserver::OnAddEntry(const NetLog::Entry& entry) {
   switch (entry.phase()) {
     case NetLog::PHASE_BEGIN:
       TRACE_EVENT_NESTABLE_ASYNC_BEGIN2(
-          "netlog", NetLog::EventTypeToString(entry.type()), entry.source().id,
+          kNetLogTracingCategory,
+          NetLog::EventTypeToString(entry.type()), entry.source().id,
           "source_type", NetLog::SourceTypeToString(entry.source().type),
           "params", scoped_refptr<base::debug::ConvertableToTraceFormat>(
               new TracedValue(params.Pass())));
       break;
     case NetLog::PHASE_END:
       TRACE_EVENT_NESTABLE_ASYNC_END2(
-          "netlog", NetLog::EventTypeToString(entry.type()), entry.source().id,
+          kNetLogTracingCategory,
+          NetLog::EventTypeToString(entry.type()), entry.source().id,
           "source_type", NetLog::SourceTypeToString(entry.source().type),
           "params", scoped_refptr<base::debug::ConvertableToTraceFormat>(
               new TracedValue(params.Pass())));
       break;
     case NetLog::PHASE_NONE:
       TRACE_EVENT_NESTABLE_ASYNC_INSTANT2(
-          "netlog", NetLog::EventTypeToString(entry.type()), entry.source().id,
+          kNetLogTracingCategory,
+          NetLog::EventTypeToString(entry.type()), entry.source().id,
           "source_type", NetLog::SourceTypeToString(entry.source().type),
           "params", scoped_refptr<base::debug::ConvertableToTraceFormat>(
               new TracedValue(params.Pass())));