Support JellyBean MR2 style of systrace

base/debug/trace_event_impl.h

 // 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.
 
 
 #ifndef BASE_DEBUG_TRACE_EVENT_IMPL_H_
 #define BASE_DEBUG_TRACE_EVENT_IMPL_H_
 
 #include "build/build_config.h"
 
@@ skipping 191 matching lines @@
   void GetEnabledTraceCategories(std::vector<std::string>* included_out,
                                  std::vector<std::string>* excluded_out);
 
   // Disable tracing for all categories.
   void SetDisabled();
   // Helper method to enable/disable tracing for all categories.
   void SetEnabled(bool enabled);
   bool IsEnabled() { return !!enable_count_; }
 
 #if defined(OS_ANDROID)
-  static void InitATrace();
+  void StartATrace();
+  void StopATrace();
 #endif
 
   // Enabled state listeners give a callback when tracing is enabled or
   // disabled. This can be used to tie into other library's tracing systems
   // on-demand.
   class EnabledStateChangedObserver {
    public:
     // Called just before the tracing system becomes
     // enabled. TraceLog::IsEnabled will return false at this point and trace
     // macros and methods called within the observer will deadlock.
@@ skipping 164 matching lines @@
   const unsigned char* watch_category_;
   std::string watch_event_name_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceLog);
 };
 
 }  // namespace debug
 }  // namespace base
 
 #endif  // BASE_DEBUG_TRACE_EVENT_IMPL_H_