Merge "Only construct real Throwable objects in AndroidFuture.readThrowable()." into sc-dev am: af04dd2ad5

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

Change-Id: I1bf40fe706b0f03443a8a6fbb6e8c84b0fa44402