Alternative heap dumping scheme.

base/trace_event/heap_profiler_stack_frame_deduplicator.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TRACE_EVENT_HEAP_PROFILER_STACK_FRAME_DEDUPLICATOR_H_
 #define BASE_TRACE_EVENT_HEAP_PROFILER_STACK_FRAME_DEDUPLICATOR_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 24 matching lines @@
     ~FrameNode();
 
     StackFrame frame;
 
     // The index of the parent stack frame in |frames_|, or -1 if there is no
     // parent frame (when it is at the bottom of the call stack).
     int parent_frame_index;
 
     // 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;
 
   StackFrameDeduplicator();
   ~StackFrameDeduplicator() override;
 
   // Inserts a backtrace where |beginFrame| is a pointer to the bottom frame
   // (e.g. main) and |endFrame| is a pointer past the top frame (most recently
   // called function), and returns the index of its leaf node in |frames_|.
@@ skipping 15 matching lines @@
   std::map<StackFrame, int> roots_;
   std::vector<FrameNode> frames_;
 
   DISALLOW_COPY_AND_ASSIGN(StackFrameDeduplicator);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_HEAP_PROFILER_STACK_FRAME_DEDUPLICATOR_H_