anchor.diff:        _forwardObservatoryPort();
   
       String deviceTmpPath = '/data/local/tmp/dev.flx';
  -    String deviceBundlePath = _getDeviceBundlePath(apk);
       runCheckedSync(adbCommandForDevice(['push', bundlePath, deviceTmpPath]));
  -    runCheckedSync(adbCommandForDevice(['shell', 'mv', deviceTmpPath, deviceBundlePath]));
       List<String> cmd = adbCommandForDevice([
         'shell', 'am', 'start',
         '-a', 'android.intent.action.RUN',
  -      '-d', deviceBundlePath,
  +      '-d', deviceTmpPath,
       ]);
       if (checked)
         cmd.addAll(['--ez', 'enable-checked-mode', 'true']);
  
positive.code: 
      print('Installing ${app.name} on device.');
      runCheckedSync(adbCommandForDevice(['install', '-r', app.localPath]));
      runCheckedSync(adbCommandForDevice(['shell', 'run-as', app.id, 'chmod', '777', _getDeviceDataPath(app)]));
      runCheckedSync(adbCommandForDevice(['shell', 'echo', '-n', _getSourceSha1(app), '>', _getDeviceSha1Path(app)]));
      return true;
    }
  
negative.code:     return false;
    }
  
    String _getDeviceSha1Path(ApplicationPackage app) {
      return '/data/local/tmp/sky.${app.id}.sha1';
    }
  
    String _getDeviceApkSha1(ApplicationPackage app) {
  