tree e53e18f1d405f972b9e8ad31b03b3ceaf5284358
parent 43fe622c34a1306c19a5a39276e2267a40feed95
author Dake Gu <dake@google.com> 1478306290 -0700
committer Dake Gu <dake@google.com> 1478307429 -0700

Fix BackgroundManagerTest

onStart() might be called multiple times, should attach before
onStart or check if isAttached().

Bug: none
Test: inheritColorByNewActivity
Change-Id: Id42d2b53ffefcff6cca6067aca7330de3b97a6e3