Add field names to Code, ConsString, and JSGlobalPropertyCell in heap snapshot.

src/profile-generator.h

Index: src/profile-generator.h
diff --git a/src/profile-generator.h b/src/profile-generator.h
index 1468777fc77d7684e1b0b4c4d65dbe898e53b980..e04ddbf3e277dd3b1b2710ad25e109e343310bee 100644
--- a/src/profile-generator.h
+++ b/src/profile-generator.h
@@ -977,15 +977,18 @@ class V8HeapExplorer : public HeapEntriesAllocator {
   const char* GetSystemEntryName(HeapObject* object);
 
   void ExtractReferences(HeapObject* obj);
-  void ExtractJSGlobalProxy(JSGlobalProxy* proxy);
-  void ExtractJSObject(HeapEntry* entry, JSObject* js_obj);
-  void ExtractString(HeapEntry* entry, String* obj);
-  void ExtractContext(HeapEntry* entry, Context* context);
-  void ExtractMap(HeapEntry* entry, Map* map);
-  void ExtractSharedFunctionInfo(HeapEntry* entry, SharedFunctionInfo* shared);
-  void ExtractScript(HeapEntry* entry, Script* script);
-  void ExtractCodeCache(HeapEntry* entry, CodeCache* code_cache);
-  void ExtractCode(HeapEntry* entry, Code* code);
+  void ExtractJSGlobalProxyReferences(JSGlobalProxy* proxy);
+  void ExtractJSObjectReferences(HeapEntry* entry, JSObject* js_obj);
+  void ExtractStringReferences(HeapEntry* entry, String* obj);
+  void ExtractContextReferences(HeapEntry* entry, Context* context);
+  void ExtractMapReferences(HeapEntry* entry, Map* map);
+  void ExtractSharedFunctionInfoReferences(HeapEntry* entry,
+                                           SharedFunctionInfo* shared);
+  void ExtractScriptReferences(HeapEntry* entry, Script* script);
+  void ExtractCodeCacheReferences(HeapEntry* entry, CodeCache* code_cache);
+  void ExtractCodeReferences(HeapEntry* entry, Code* code);
+  void ExtractJSGlobalPropertyCellReferences(HeapEntry* entry,
+                                             JSGlobalPropertyCell* cell);
   void ExtractClosureReferences(JSObject* js_obj, HeapEntry* entry);
   void ExtractPropertyReferences(JSObject* js_obj, HeapEntry* entry);
   void ExtractElementReferences(JSObject* js_obj, HeapEntry* entry);