Handle BACK key with focus in search ACTV correctly
Handle BACK key with focus in search ACTV correctly

Fixes http://b/issue?id=2124700
"Back key kills pivoted-in search, should go back to QSB"

Change-Id: Ib54c5de158fc362faa3f0fef553ee403437635ae

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base