Add read only handles for the following predefined symbols

vm/symbols.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_SYMBOLS_H_
 #define VM_SYMBOLS_H_
 
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
 
@@ skipping 129 matching lines @@
   V(_ExternalInt64Array, "_ExternalInt64Array")                                \
   V(_ExternalUint64Array, "_ExternalUint64Array")                              \
   V(_ExternalFloat32Array, "_ExternalFloat32Array")                            \
   V(_ExternalFloat64Array, "_ExternalFloat64Array")                            \
   V(_WeakProperty, "_WeakProperty")                                            \
   V(InvocationMirror, "_InvocationMirror")                                     \
   V(AllocateInvocationMirror, "_allocateInvocationMirror")                     \
 
 #define PREDEFINED_SYMBOL_HANDLES_LIST(V)                                      \
   V(Dot)                                                                       \
+  V(EqualOperator)                                                             \
+  V(IndexToken)                                                                \
+  V(AssignIndexToken)                                                          \
+  V(This)                                                                      \
 
 // Contains a list of frequently used strings in a canonicalized form. This
 // list is kept in the vm_isolate in order to share the copy across isolates
 // without having to maintain copies in each isolate.
 class Symbols : public AllStatic {
  public:
   enum { kMaxOneCharCodeSymbol = 0xFF };
 
   // List of strings that are pre created in the vm isolate.
   enum SymbolId {
@@ skipping 53 matching lines @@
 
   // Returns char* of predefined symbol.
   static const char* Name(SymbolId symbol);
 
   static RawString* FromCharCode(int32_t char_code);
 
   static RawString** PredefinedAddress() {
     return reinterpret_cast<RawString**>(&predefined_);
   }
 
+  static bool IsPredefinedHandle(uword address);
+
  private:
   enum {
     kInitialVMIsolateSymtabSize = ((kMaxId + 15) & -16),
     kInitialSymtabSize = 256
   };
 
   // Helper functions to create a symbol given a string or set of characters.
   template<typename CharacterType, typename CallbackType>
   static RawString* NewSymbol(const CharacterType* characters,
                               intptr_t len,
@@ skipping 45 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_