formatStateDescription() in onProgressRefresh() is causing performance
degradation with accessibility off.
Note that stateDescription is set in onInitializeAccessibilityNodeInfo
to ensure that accessibility always get the update-to-date
stateDescription. Otherwise, stateDescription might be stale on first
accessibility focus and the user might get wrong information.
Fix: b/166215147
Test: tested with talkback enabled from the beginning or from the
middle.
Change-Id: I9fb99b479b172d87c8d0fa1b8765dab53445b993
fc9d9b800f