New Heap Profiler: add API method for finding a graph node by id.

include/v8-profiler.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
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   /** Returns heap snapshot UID (assigned by the profiler.) */
   unsigned GetUid() const;
 
   /** Returns heap snapshot title. */
   Handle<String> GetTitle() const;
 
   /** Returns the root node of the heap graph. */
   const HeapGraphNode* GetRoot() const;
 
+  /** Returns a node by its id. */
+  const HeapGraphNode* GetNodeById(uint64_t id) const;
+
   /**
    * Returns a diff between this snapshot and another one. Only snapshots
    * of the same type can be compared.
    */
   const HeapSnapshotsDiff* CompareWith(const HeapSnapshot* snapshot) const;
 
   /**
    * Prepare a serialized representation of the snapshot. The result
    * is written into the stream provided in chunks of specified size.
    * The total length of the serialized snapshot is unknown in
@@ skipping 43 matching lines @@
 };
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 
 
 #endif  // V8_V8_PROFILER_H_