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

third_party/tcmalloc/chromium/src/tests/malloc_extension_c_test.c

Index: third_party/tcmalloc/chromium/src/tests/malloc_extension_c_test.c
diff --git a/third_party/tcmalloc/chromium/src/tests/malloc_extension_c_test.c b/third_party/tcmalloc/chromium/src/tests/malloc_extension_c_test.c
index e384b764b53d1684213b8891e5eba01ad39d617c..57cdbbd2239e353bbdcb5fd59b6bededa0d53a0f 100644
--- a/third_party/tcmalloc/chromium/src/tests/malloc_extension_c_test.c
+++ b/third_party/tcmalloc/chromium/src/tests/malloc_extension_c_test.c
@@ -126,6 +126,14 @@ void TestMallocExtension(void) {
   if (MallocExtension_GetAllocatedSize(x) < 10) {
     FAIL("GetEstimatedAllocatedSize returned a bad value (too small)");
   }
+  if (MallocExtension_GetOwnership(x) != MallocExtension_kOwned) {
+    FAIL("DidAllocatePtr returned a bad value (kNotOwned)");
+  }
+  /* TODO(csilvers): this relies on undocumented behavior that
+     GetOwnership works on stack-allocated variables.  Use a better test. */
+  if (MallocExtension_GetOwnership(hist) != MallocExtension_kNotOwned) {
+    FAIL("DidAllocatePtr returned a bad value (kOwned)");
+  }
 
   free(x);
 }