Merge google-perftools r109 (the current contents of third_party/tcmalloc/vendor)

third_party/tcmalloc/chromium/src/heap-profile-table.cc

Index: third_party/tcmalloc/chromium/src/heap-profile-table.cc
===================================================================
--- third_party/tcmalloc/chromium/src/heap-profile-table.cc	(revision 88335)
+++ third_party/tcmalloc/chromium/src/heap-profile-table.cc	(working copy)
@@ -342,7 +342,8 @@
   // any gaps.  Whew!
   int map_length = snprintf(buf, size, "%s", kProcSelfMapsHeader);
   if (map_length < 0 || map_length >= size) return 0;
-  map_length += FillProcSelfMaps(buf + map_length, size - map_length);
+  bool dummy;   // "wrote_all" -- did /proc/self/maps fit in its entirety?
+  map_length += FillProcSelfMaps(buf + map_length, size - map_length, &dummy);
   RAW_DCHECK(map_length <= size, "");
   char* const map_start = buf + size - map_length;      // move to end
   memmove(map_start, buf, map_length);