Merge "Only construct real Throwable objects in AndroidFuture.readThrowable()." into sc-dev am: af04dd2a am: 831f5db0 am: 2af324b7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15302018

Change-Id: I5d57789cde4abf74d907f737ea9caee4de11e537