Add snapshot mode for heap profiling.

src/log.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 231 matching lines @@
 #ifdef ENABLE_LOGGING_AND_PROFILING
   static StateTag state() {
     return current_state_ ? current_state_->state() : OTHER;
   }
 
   static bool is_logging() {
     return is_logging_;
   }
 
   // Pause/Resume collection of profiling data.
-  // When data collection is paused, Tick events are discarded until
+  // When data collection is paused, CPU Tick events are discarded until
   // data collection is Resumed.
-  static bool IsProfilerPaused();
-  static void PauseProfiler();
-  static void ResumeProfiler();
+  static void PauseProfiler(int flags);
+  static void ResumeProfiler(int flags);
+  static int GetActiveProfilerModules();
 
   // If logging is performed into a memory buffer, allows to
   // retrieve previously written messages. See v8.h.
   static int GetLogLines(int from_pos, char* dest_buf, int max_size);
 
   // Logs all compiled functions found in the heap.
   static void LogCompiledFunctions();
 
  private:
 
@@ skipping 71 matching lines @@
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
   static void Trace(TickSample* sample);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOG_H_