search bring up global search. This still respects the case where an
app has chosen to disable search entirely by overriding
onSearchRequested() to return false.
I do not believe any changes to the SearchManager documentation
(http://developer.android.com/reference/android/app/SearchManager.html#HowSearchIsInvoked)
are necessary, because this documentation already indicates that
pressing the search button within an app that does nothing special with
regard to search can bring up global search.
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