Bug 896170 - Part 1: Send Session:Restore only on initial onCreate. r=mfinkle

--HG--
extra : rebase_source : bde410dbc3c24210cdf3c92a71c4ef1f25fc5de0
Bug 896170 - Part 2: Use intent extra to trigger restore on restart. r=mfinkle

--HG--
extra : rebase_source : fd14708cfc970dce433c02c1a08863e38680e5b3