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

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

Index: third_party/tcmalloc/chromium/src/google/malloc_hook.h
diff --git a/third_party/tcmalloc/chromium/src/google/malloc_hook.h b/third_party/tcmalloc/chromium/src/google/malloc_hook.h
index f5575f13999f267d2351bdb29bbf228aec205193..245d0e16fd5ce083a463f6edc1b9197376e3a742 100644
--- a/third_party/tcmalloc/chromium/src/google/malloc_hook.h
+++ b/third_party/tcmalloc/chromium/src/google/malloc_hook.h
@@ -81,6 +81,14 @@ extern "C" {
 # endif
 #endif
 
+// The C++ methods below call the C version (MallocHook_*), and thus
+// convert between an int and a bool.  Windows complains about this
+// (a "performance warning") which we don't care about, so we suppress.
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable:4800)
+#endif
+
 // Note: malloc_hook_c.h defines MallocHook_*Hook and
 // MallocHook_{Add,Remove}*Hook.  The version of these inside the MallocHook
 // class are defined in terms of the malloc_hook_c version.  See malloc_hook_c.h
@@ -229,7 +237,7 @@ class PERFTOOLS_DLL_DECL MallocHook {
   inline static bool RemovePreSbrkHook(PreSbrkHook hook) {
     return MallocHook_RemovePreSbrkHook(hook);
   }
-  inline static void InvokePreSbrkHook(std::ptrdiff_t increment);
+  inline static void InvokePreSbrkHook(ptrdiff_t increment);
 
   // The SbrkHook is invoked whenever sbrk is called -- except when
   // the increment is 0.  This is because sbrk(0) is often called
@@ -242,7 +250,7 @@ class PERFTOOLS_DLL_DECL MallocHook {
   inline static bool RemoveSbrkHook(SbrkHook hook) {
     return MallocHook_RemoveSbrkHook(hook);
   }
-  inline static void InvokeSbrkHook(const void* result, std::ptrdiff_t increment);
+  inline static void InvokeSbrkHook(const void* result, ptrdiff_t increment);
 
   // Get the current stack trace.  Try to skip all routines up to and
   // and including the caller of MallocHook::Invoke*.
@@ -338,8 +346,13 @@ class PERFTOOLS_DLL_DECL MallocHook {
                                    size_t new_size,
                                    int flags,
                                    const void* new_addr);
-  static void InvokePreSbrkHookSlow(std::ptrdiff_t increment);
-  static void InvokeSbrkHookSlow(const void* result, std::ptrdiff_t increment);
+  static void InvokePreSbrkHookSlow(ptrdiff_t increment);
+  static void InvokeSbrkHookSlow(const void* result, ptrdiff_t increment);
 };
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+
 #endif /* _MALLOC_HOOK_H_ */