A temporary workaround for huge heap snapshots problem.

src/profile-generator.h

Index: src/profile-generator.h
diff --git a/src/profile-generator.h b/src/profile-generator.h
index 9ab44a1e210061ac7965f398cb7309dbc84fb288..6bada36d577f96ad9a1a261f245a5f642d57f7b7 100644
--- a/src/profile-generator.h
+++ b/src/profile-generator.h
@@ -654,6 +654,7 @@ class HeapSnapshot {
   HeapEntry* gc_roots() { return gc_roots_entry_; }
   HeapEntry* natives_root() { return natives_root_entry_; }
   List<HeapEntry*>* entries() { return &entries_; }
+  int raw_entries_size() { return raw_entries_size_; }
 
   void AllocateEntries(
       int entries_count, int children_count, int retainers_count);
@@ -689,9 +690,7 @@ class HeapSnapshot {
   char* raw_entries_;
   List<HeapEntry*> entries_;
   bool entries_sorted_;
-#ifdef DEBUG
   int raw_entries_size_;
-#endif
 
   friend class HeapSnapshotTester;
 
@@ -1097,6 +1096,7 @@ class HeapSnapshotJSONSerializer {
   }
 
   void EnumerateNodes();
+  HeapSnapshot* CreateFakeSnapshot();
   int GetNodeId(HeapEntry* entry);
   int GetStringId(const char* s);
   void SerializeEdge(HeapGraphEdge* edge);
@@ -1108,6 +1108,8 @@ class HeapSnapshotJSONSerializer {
   void SerializeStrings();
   void SortHashMap(HashMap* map, List<HashMap::Entry*>* sorted_entries);
 
+  static const int kMaxSerializableSnapshotRawSize;
+
   HeapSnapshot* snapshot_;
   HashMap nodes_;
   HashMap strings_;