Add a mode flag to the tracing framework.

content/app/content_main_runner.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 "content/public/app/content_main_runner.h"
 
 #include <stdlib.h>
 
 #include "base/allocator/allocator_extension.h"
 #include "base/at_exit.h"
@@ skipping 618 matching lines @@
 #if defined(OS_WIN)
     // Route stdio to parent console (if any) or create one.
     if (command_line.HasSwitch(switches::kEnableLogging))
       base::RouteStdioToConsole();
 #endif
 
     // Enable startup tracing asap to avoid early TRACE_EVENT calls being
     // ignored.
     if (command_line.HasSwitch(switches::kTraceStartup)) {
       base::debug::TraceLog::GetInstance()->SetEnabled(
-          command_line.GetSwitchValueASCII(switches::kTraceStartup));
+          command_line.GetSwitchValueASCII(switches::kTraceStartup),
+          base::debug::TraceLog::RECORD_UNTIL_FULL);
     }
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
     // We need to allocate the IO Ports before the Sandbox is initialized or
     // the first instance of SystemMonitor is created.
     // It's important not to allocate the ports for processes which don't
     // register with the system monitor - see crbug.com/88867.
     if (process_type.empty() ||
         process_type == switches::kPluginProcess ||
         process_type == switches::kRendererProcess ||
@@ skipping 162 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
 };
 
 // static
 ContentMainRunner* ContentMainRunner::Create() {
   return new ContentMainRunnerImpl();
 }
 
 }  // namespace content