Update the tcmalloc chromium branch to r144 (gperftools 2.0), and merge chromium-specific changes.

third_party/tcmalloc/chromium/src/windows/port.h

Index: third_party/tcmalloc/chromium/src/windows/port.h
diff --git a/third_party/tcmalloc/chromium/src/windows/port.h b/third_party/tcmalloc/chromium/src/windows/port.h
index 0faba01c2cac52798bce505ef4798cde21a3c385..e9a020656b36fd63ea3251de42a8d0bc4a0e2900 100644
--- a/third_party/tcmalloc/chromium/src/windows/port.h
+++ b/third_party/tcmalloc/chromium/src/windows/port.h
@@ -65,14 +65,15 @@
 
 /*
  * 4018: signed/unsigned mismatch is common (and ok for signed_i < unsigned_i)
- * 4244: otherwise we get problems when substracting two size_t's to an int
+ * 4244: otherwise we get problems when subtracting two size_t's to an int
  * 4288: VC++7 gets confused when a var is defined in a loop and then after it
  * 4267: too many false positives for "conversion gives possible data loss"
  * 4290: it's ok windows ignores the "throw" directive
  * 4996: Yes, we're ok using "unsafe" functions like vsnprintf and getenv()
+ * 4146: internal_logging.cc intentionally negates an unsigned value
  */
 #ifdef _MSC_VER
-#pragma warning(disable:4018 4244 4288 4267 4290 4996)
+#pragma warning(disable:4018 4244 4288 4267 4290 4996 4146)
 #endif
 
 #ifndef __cplusplus
@@ -165,6 +166,10 @@ EXTERN_C int perftools_pthread_once(pthread_once_t *once_control,
 #endif  /* __cplusplus */
 #endif  /* HAVE_PTHREAD */
 
+inline void sched_yield(void) {
+  Sleep(0);
+}
+
 /*
  * __declspec(thread) isn't usable in a dll opened via LoadLibrary().
  * But it doesn't work to LoadLibrary() us anyway, because of all the
@@ -260,7 +265,7 @@ class SpinLockHolder {  // Acquires a spinlock for as long as the scope lasts
 #define MAP_PRIVATE    MEM_COMMIT
 #define MAP_SHARED     MEM_RESERVE   /* value of this #define is 100% arbitrary */
 
-#if __STDC__
+#if __STDC__ && !defined(__MINGW32__)
 typedef _off_t off_t;
 #endif
 
@@ -372,7 +377,6 @@ inline char *getcwd(char *buf, size_t size) {
 inline int mkdir(const char *pathname, int) {
   return _mkdir(pathname);
 }
-#endif
 
 inline FILE *popen(const char *command, const char *type) {
   return _popen(command, type);
@@ -380,13 +384,14 @@ inline FILE *popen(const char *command, const char *type) {
 inline int pclose(FILE *stream) {
   return _pclose(stream);
 }
+#endif
 
 EXTERN_C PERFTOOLS_DLL_DECL void WriteToStderr(const char* buf, int len);
 
 /* ----------------------------------- SYSTEM/PROCESS */
 
 typedef int pid_t;
-#if __STDC__
+#if __STDC__ && !defined(__MINGW32__)
 inline pid_t getpid(void) { return _getpid(); }
 #endif
 inline pid_t getppid(void) { return 0; }
@@ -410,10 +415,14 @@ inline unsigned int sleep(unsigned int seconds) {
   return 0;
 }
 
+// mingw64 seems to define timespec (though mingw.org mingw doesn't),
+// protected by the _TIMESPEC_DEFINED macro.
+#ifndef _TIMESPEC_DEFINED
 struct timespec {
   int tv_sec;
   int tv_nsec;
 };
+#endif
 
 inline int nanosleep(const struct timespec *req, struct timespec *rem) {
   Sleep(req->tv_sec * 1000 + req->tv_nsec / 1000000);