Add a mode flag to the tracing framework.

components/tracing/child_trace_message_filter.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 "components/tracing/child_trace_message_filter.h"
 
 #include "base/debug/trace_event.h"
 #include "base/message_loop_proxy.h"
 #include "components/tracing/tracing_messages.h"
 
@@ skipping 30 matching lines @@
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 ChildTraceMessageFilter::~ChildTraceMessageFilter() {}
 
 void ChildTraceMessageFilter::OnBeginTracing(
     const std::vector<std::string>& included_categories,
     const std::vector<std::string>& excluded_categories,
-    base::TimeTicks browser_time) {
+    base::TimeTicks browser_time,
+    int options) {
 #if defined(__native_client__)
   // NaCl and system times are offset by a bit, so subtract some time from
   // the captured timestamps. The value might be off by a bit due to messaging
   // latency.
   base::TimeDelta time_offset = base::TimeTicks::NowFromSystemTraceTime() -
       browser_time;
   TraceLog::GetInstance()->SetTimeOffset(time_offset);
 #endif
-  TraceLog::GetInstance()->SetEnabled(included_categories,
-                                      excluded_categories);
+  TraceLog::GetInstance()->SetEnabled(
+      included_categories,
+      excluded_categories,
+      static_cast<base::debug::TraceLog::Options>(options));
 }
 
 void ChildTraceMessageFilter::OnEndTracing() {
   TraceLog::GetInstance()->SetDisabled();
 
   // Flush will generate one or more callbacks to OnTraceDataCollected. It's
   // important that the last OnTraceDataCollected gets called before
   // EndTracingAck below. We are already on the IO thread, so the
   // OnTraceDataCollected calls will not be deferred.
   TraceLog::GetInstance()->Flush(
@@ skipping 36 matching lines @@
   if (!ipc_message_loop_->BelongsToCurrentThread()) {
     ipc_message_loop_->PostTask(FROM_HERE,
         base::Bind(&ChildTraceMessageFilter::OnTraceNotification, this,
                    notification));
     return;
   }
   channel_->Send(new TracingHostMsg_TraceNotification(notification));
 }
 
 }  // namespace components