anchor.diff:  
     @override
     Future<Success> clearCpuProfile(String isolateId) {
  -    return _trackFuture(
  -        'clearCpuProfile', _vmService.clearCpuProfile(isolateId));
  +    return _trackFuture('clearCpuProfile',
  +        callMethod('_clearCpuProfile', isolateId: isolateId));
     }
   
     @override
  
positive.code:         _vmService.removeBreakpoint(isolateId, breakpointId));
    }
  
    @override
    Future<Success> requestHeapSnapshot(
      String isolateId,
      String roots,
      bool collectGarbage,
    ) {
      return _trackFuture('requestHeapSnapshot',
          _vmService.requestHeapSnapshot(isolateId, roots, collectGarbage));
    }
  
    @override
  
negative.code:     return _trackFuture('clearVMTimeline', _vmService.clearVMTimeline());
    }
  
    @deprecated
    @override
    Future<Success> collectAllGarbage(String isolateId) {
      throw UnsupportedError('Private service RPC');
    }
  
    @override
  