Fix gperftools to not arm the profiling timer by default.

third_party/tcmalloc/chromium/src/profiler.cc

 // 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 272 matching lines @@
     instance->collector_.Add(depth, stack);
   }
 }
 
 #if !(defined(__CYGWIN__) || defined(__CYGWIN32__))
 
 extern "C" PERFTOOLS_DLL_DECL void ProfilerRegisterThread() {
   ProfileHandlerRegisterThread();
 }
 
+extern "C" PERFTOOLS_DLL_DECL void ProfilerUnregisterThread() {
+  ProfileHandlerUnregisterThread();
+}
+
 extern "C" PERFTOOLS_DLL_DECL void ProfilerFlush() {
   CpuProfiler::instance_.FlushTable();
 }
 
 extern "C" PERFTOOLS_DLL_DECL int ProfilingIsEnabledForAllThreads() {
   return CpuProfiler::instance_.Enabled();
 }
 
 extern "C" PERFTOOLS_DLL_DECL int ProfilerStart(const char* fname) {
   return CpuProfiler::instance_.Start(fname, NULL);
@@ skipping 13 matching lines @@
   CpuProfiler::instance_.GetCurrentState(state);
 }
 
 #else  // OS_CYGWIN
 
 // ITIMER_PROF doesn't work under cygwin.  ITIMER_REAL is available, but doesn't
 // work as well for profiling, and also interferes with alarm().  Because of
 // these issues, unless a specific need is identified, profiler support is
 // disabled under Cygwin.
 extern "C" void ProfilerRegisterThread() { }
+extern "C" void ProfilerUnregisterThread() { }
 extern "C" void ProfilerFlush() { }
 extern "C" int ProfilingIsEnabledForAllThreads() { return 0; }
 extern "C" int ProfilerStart(const char* fname) { return 0; }
 extern "C" int ProfilerStartWithOptions(const char *fname,
                                         const ProfilerOptions *options) {
   return 0;
 }
 extern "C" void ProfilerStop() { }
 extern "C" void ProfilerGetCurrentState(ProfilerState* state) {
   memset(state, 0, sizeof(*state));
 }
 
 #endif  // OS_CYGWIN
 
 // DEPRECATED routines
 extern "C" PERFTOOLS_DLL_DECL void ProfilerEnable() { }
 extern "C" PERFTOOLS_DLL_DECL void ProfilerDisable() { }