Support for taking full snapshots from 'dart', not just 'dart_bootstrap'.

runtime/vm/symbols.h

Index: runtime/vm/symbols.h
diff --git a/runtime/vm/symbols.h b/runtime/vm/symbols.h
index 83c7458c255e3cb3fe9b9fd1c5ed766b6d016afe..f4236b2b439bca37f892e0c113343e12f667b8b6 100644
--- a/runtime/vm/symbols.h
+++ b/runtime/vm/symbols.h
@@ -555,19 +555,17 @@ class Symbols : public AllStatic {
   static void InitOnce(Isolate* isolate);
   static void InitOnceFromSnapshot(Isolate* isolate);
 
-  // Add all the symbols that were cached in the VM isolate to this isolate,
-  // we do this when an Isolate is not created from the snapshot so that
-  // we get a unified symbol table that can be be dumped into the VM isolate
-  // snapshot.
-  static void AddPredefinedSymbolsToIsolate();
-
   // Initialize and setup a symbol table for the isolate.
   static void SetupSymbolTable(Isolate* isolate);
 
+  static RawArray* UnifiedSymbolTable();
+
+#if defined(DART_PRECOMPILER)
   // Treat the symbol table as weak and collect garbage. Answer the number of
   // symbols deleted from the symbol table because they where not referenced
   // from anywhere else.
   static intptr_t Compact(Isolate* isolate);
+#endif
 
   // Creates a Symbol given a C string that is assumed to contain
   // UTF-8 encoded characters and '\0' is considered a termination character.