Only drain main looper when it is paused. #2320
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Only drain main looper when it is paused.
ControlledLooper.drainMainThreadUntilIdle was created
so Robolectric can manually execute tasks when main looper is paused.
Now with the introduction of INSTRUMENTATION_TEST looper mode with a
free running looper, it doesn't make sense to always idle the main looper,
and could lead to deviation of behavior between a test run with Robolectric
INSTRUMENTATION_TEST mode and real android.
This commit changes drainMainThreadUntilIdle so its a no-op if main looper
is not paused.