Alternative heap dumping scheme.

base/trace_event/heap_profiler_stack_frame_deduplicator.h

Index: base/trace_event/heap_profiler_stack_frame_deduplicator.h
diff --git a/base/trace_event/heap_profiler_stack_frame_deduplicator.h b/base/trace_event/heap_profiler_stack_frame_deduplicator.h
index 4932534e1d790a578290effd9590bc0fe43a64bb..2cea446964c33c8bd784bfe02d7fb67ba757bea3 100644
--- a/base/trace_event/heap_profiler_stack_frame_deduplicator.h
+++ b/base/trace_event/heap_profiler_stack_frame_deduplicator.h
@@ -42,6 +42,9 @@ class BASE_EXPORT StackFrameDeduplicator : public ConvertableToTraceFormat {
 
     // Indices into |frames_| of frames called from the current frame.
     std::map<StackFrame, int> children;
+
+    // Whether index of this node was ever returned from Insert().
+    bool indexed;
   };
 
   using ConstIterator = std::vector<FrameNode>::const_iterator;