leanback janktest: use extra to initialize fastlane state

faster and less problem.

Bug: 71904218
Test: adb shell am instrument -w -e class
      com.android.uibench.janktests.UiBenchLeanbackJankTests#testBrowseContentScroll
      com.android.uibench.janktests/android.test.InstrumentationTestRunner

Change-Id: I4a5c2e0b993f3dc5f678e7b29b2b7e10b7792fe4