Add helper method to check if intent is deferred

Added a isDeferredIntent helper method to check if an intent has the
extra labeling it as in deferred setup.

Change-Id: I78961983ce05e689ca33c246fc8ff4d954c634de
Fixes: 112154455
Test: robolectric tests
(cherry picked from commit 076152d921bebe63f8de4d4436519a1d20ab8f2f)