Merge tcmalloc r111 (perftools v. 1.8) with the chromium/ branch.

third_party/tcmalloc/chromium/src/profile-handler.cc

 // Copyright (c) 2009, 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 18 matching lines @@
 
 // ---
 // Author: Sanjay Ghemawat
 //         Nabeel Mian
 //
 // Implements management of profile timers and the corresponding signal handler.
 
 #include "config.h"
 #include "profile-handler.h"
 
-#if !(defined(__CYGWIN__) || defined(__CYGWIN32__))
+#if !(defined(__CYGWIN__) || defined(__CYGWIN32__)) && !defined(__native_client__)
 
 #include <stdio.h>
 #include <errno.h>
 #include <sys/time.h>
 
 #include <list>
 #include <string>
 
 #include "base/dynamic_annotations.h"
 #include "base/logging.h"
@@ skipping 421 matching lines @@
 }
 
 extern "C" void ProfileHandlerReset() {
   return ProfileHandler::Instance()->Reset();
 }
 
 extern "C" void ProfileHandlerGetState(ProfileHandlerState* state) {
   ProfileHandler::Instance()->GetState(state);
 }
 
-#else  // OS_CYGWIN
+#else  // !defined(OS_CYGWIN) && !defined(__native_client__)
 
 // 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.
+//
+// Native Client runtime also does not have signals working.
 extern "C" void ProfileHandlerRegisterThread() {
 }
 
 extern "C" ProfileHandlerToken* ProfileHandlerRegisterCallback(
     ProfileHandlerCallback callback, void* callback_arg) {
   return NULL;
 }
 
 extern "C" void ProfileHandlerUnregisterCallback(ProfileHandlerToken* token) {
 }
 
 extern "C" void ProfileHandlerReset() {
 }
 
 extern "C" void ProfileHandlerGetState(ProfileHandlerState* state) {
 }
 
-#endif  // OS_CYGWIN
+#endif  // !defined(OS_CYGWIN) && !defined(__native_client__)