Report resizeTask failure as boolean result

Previously ActivityTaskManagerService#resizeTask throws
IllegalArgumentException when the task windowing mode is not suitable for
resize. However caller cannot ensure the windowing mode before
acquiring window lock.

To descriminate windowing mode mismatch from programming errors
(e.g. Preconditions.check failures), the CL changes the way of reporting
windowing mode mismatch to returning boolean value.

Bug: 156196109
Test: None
Change-Id: I36f473899c4f6d7f5d5d25f081a57fe14ebbb1a8