Refactor 'dart:profiler' UserTag API

runtime/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 300 matching lines @@
   V(_SourceLocation, "_SourceLocation")                                        \
   V(hashCode, "get:hashCode")                                                  \
   V(_leftShiftWithMask32, "_leftShiftWithMask32")                              \
   V(OptimizedOut, "<optimized out>")                                           \
   V(NotInitialized, "<not initialized>")                                       \
   V(ClassId, "get:_classId")                                                   \
   V(AllocationStubFor, "Allocation stub for ")                                 \
   V(TempParam, ":temp_param")                                                  \
   V(UserTag, "UserTag")                                                        \
   V(_UserTag, "_UserTag")                                                      \
+  V(Default, "Default")                                                        \
   V(StubPrefix, "[Stub] ")                                                     \
 
 
 // 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 };
 
@@ skipping 199 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_