Add a mode flag to the tracing framework.

chrome/test/base/tracing.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 "chrome/test/base/tracing.h"
 
 #include "base/debug/trace_event.h"
 #include "base/memory/singleton.h"
 #include "base/message_loop.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 12 matching lines @@
   }
 
   InProcessTraceController()
       : is_waiting_on_watch_(false),
         watch_notification_count_(0) {}
   virtual ~InProcessTraceController() {}
 
   bool BeginTracing(const std::string& categories) {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     return content::TraceController::GetInstance()->BeginTracing(
-        this, categories);
+        this, categories, base::debug::TraceLog::RECORD_UNTIL_FULL);
   }
 
   bool BeginTracingWithWatch(const std::string& categories,
                              const std::string& category_name,
                              const std::string& event_name,
                              int num_occurrences) {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     DCHECK(num_occurrences > 0);
     watch_notification_count_ = num_occurrences;
     return BeginTracing(categories) &&
@@ skipping 106 matching lines @@
 bool WaitForWatchEvent(base::TimeDelta timeout) {
   return InProcessTraceController::GetInstance()->WaitForWatchEvent(timeout);
 }
 
 bool EndTracing(std::string* json_trace_output) {
   return InProcessTraceController::GetInstance()->EndTracing(json_trace_output);
 }
 
 }  // namespace tracing