[NOT TO COMMIT!] Replace third_party/tcmalloc/chromium with tcmalloc r136 (the latest).

third_party/tcmalloc/chromium/src/google/profiler.h

 /* Copyright (c) 2005, Google Inc.
  * 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
@@ skipping 90 matching lines @@
    * in the system before starting the profiler, then to make
    * filter_in_thread be a very simple function which retrieves those
    * results in an async-signal-safe way.  Retrieval could be done
    * using thread-specific data, or using a shared data structure that
    * supports async-signal-safe lookups.
    */
   int (*filter_in_thread)(void *arg);
   void *filter_in_thread_arg;
 };
 
-/* Start profiling and write profile info into fname.
+/* Start profiling and write profile info into fname, discarding any
+ * existing profiling data in that file.
  *
  * This is equivalent to calling ProfilerStartWithOptions(fname, NULL).
  */
 PERFTOOLS_DLL_DECL int ProfilerStart(const char* fname);
 
-/* Start profiling and write profile into fname.
+/* Start profiling and write profile into fname, discarding any
+ * existing profiling data in that file.
  *
  * The profiler is configured using the options given by 'options'.
  * Options which are not specified are given default values.
  *
  * 'options' may be NULL, in which case all are given default values.
  *
  * Returns nonzero if profiling was started sucessfully, or zero else.
  */
 PERFTOOLS_DLL_DECL int ProfilerStartWithOptions(
     const char *fname, const struct ProfilerOptions *options);
@@ skipping 29 matching lines @@
   char   profile_name[1024];  /* Name of profile file being written, or '\0' */
   int    samples_gathered;    /* Number of samples gathered so far (or 0) */
 };
 PERFTOOLS_DLL_DECL void ProfilerGetCurrentState(struct ProfilerState* state);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  /* BASE_PROFILER_H_ */