Add a mode flag to the tracing framework.

content/browser/tracing/trace_message_filter.cc

Index: content/browser/tracing/trace_message_filter.cc
diff --git a/content/browser/tracing/trace_message_filter.cc b/content/browser/tracing/trace_message_filter.cc
index de5b2fd93e18d66b7e533236b741c04f7550a82c..457538185ae17677286d69f49ce21601b9745eff 100644
--- a/content/browser/tracing/trace_message_filter.cc
+++ b/content/browser/tracing/trace_message_filter.cc
@@ -56,11 +56,13 @@ bool TraceMessageFilter::OnMessageReceived(const IPC::Message& message,
 
 void TraceMessageFilter::SendBeginTracing(
     const std::vector<std::string>& included_categories,
-    const std::vector<std::string>& excluded_categories) {
+    const std::vector<std::string>& excluded_categories,
+    base::debug::TraceMode mode) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   Send(new TracingMsg_BeginTracing(included_categories,
                                    excluded_categories,
-                                   base::TimeTicks::NowFromSystemTraceTime()));
+                                   base::TimeTicks::NowFromSystemTraceTime(),
+                                   mode));
 }
 
 void TraceMessageFilter::SendEndTracing() {