Currently, TvInputManagerService notifies the initial state of each
input via TvInputManagetCallback#onInputStateChanged after TvInputManager
is created. However, this is racy because the client may call methods
like getTvInputState() before the initialization.
This patch makes sure that the client gets the control when the initialization
finishes completely.
Bug: 18419452
Change-Id: I5d8141c20984013e68f2809120710c670557c9ad
993f81e238