Merge "Only construct real Throwable objects in AndroidFuture.readThrowable()." into sc-dev am: af04dd2a am: 0f17f27c

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

Change-Id: Ia697794a85e18248eb5e49d36bb038402c20f6a4