Record Chrome trace events in tcmalloc heap profiles

third_party/tcmalloc/chromium/src/stacktrace_x86-inl.h

Index: third_party/tcmalloc/chromium/src/stacktrace_x86-inl.h
diff --git a/third_party/tcmalloc/chromium/src/stacktrace_x86-inl.h b/third_party/tcmalloc/chromium/src/stacktrace_x86-inl.h
index abbe0a923ccc8b1171b36a03f085e2a3961033ac..60b63aad3018b4b0d07f9ee0f68872ffa972f559 100644
--- a/third_party/tcmalloc/chromium/src/stacktrace_x86-inl.h
+++ b/third_party/tcmalloc/chromium/src/stacktrace_x86-inl.h
@@ -290,6 +290,17 @@ static void **NextStackFrame(void **old_sp, const void *uc) {
 //   int skip_count: how many stack pointers to skip before storing in result
 //   void* ucp: a ucontext_t* (GetStack{Trace,Frames}WithContext only)
 
+//typedef int PseudoStackFunction(void** stack);
+//extern PseudoStackFunction* pseudo_stack_function;
+//int GET_STACK_TRACE_OR_FRAMES {
+//  int n = pseudo_stack_function(result);
+//#if IS_STACK_FRAMES
+//  // TODO(jamescook): Can we just skip this?
+//  memset(sizes, 0, n * sizeof(void*));  // Report unknown size.
+//#endif
+//  return n;
+//}
+
 int GET_STACK_TRACE_OR_FRAMES {
   void **sp;
 #if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2) || __llvm__