Merge "Only construct real Throwable objects in AndroidFuture.readThrowable()." into sc-dev am: af04dd2a am: 0f17f27c am: 2804da85

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

Change-Id: I16b7796a3ac1a760afc0ca183b09a64134536886