(Regarding the experimental `React.unstable_Profiler` API and reactjs/rfcs/pull/51.)

PR #13058 changed the behavior of React profiling builds to opt host roots into `ProfileMode` if the React DevTools extension is detected. This was necessary in order to have accurate tree base time measurements for the visual flame graphs.

The Profiler plug-in for DevTools does feature detection to determine if it's enabled by looking at each root and seeing if any of the fibers contain an `actualDuration` attribute,

The problem is that the `actualDuration` attribute will be present on v16.4 fibers, which pre-date PR #13058. As a result, the Profiler UI may enable itself with versions of React that it cannot work correctly with.

Perhaps an easy solution would be to rename one of the `unstable_Profiler`'s fiber attributes prior to the next minor release (e.g. `treeBaseTime` -> `treeBaseDuration`) and change the DevTools Profiler to feature check using this new name instead.
invokeGuardedCallback(
        null,
        commitAllLifeCycles,
        null,
        root,
        committedExpirationTime,
      );
      if (hasCaughtError()) {
        didError = true;
        error = clearCaughtError();
      }
    } else {
      try {
        commitAllLifeCycles(root, committedExpirationTime);
      } catch (e) {
        didError = true;
        error = e;
      }
    }
    if (didError) {
      invariant(
        nextEffect !== null,
        'Should have next effect. This error is likely caused by a bug ' +
          'in React. Please file an issue.',
      );
      captureCommitPhaseError(nextEffect, error);
      if (nextEffect !== null) {
        nextEffect = nextEffect.nextEffect;
      }
    }