Merge "Expose patch reader for consumption" am: 952ddd532b am: 7b331f19d9 am: e88872597b am: 4f8b7fb2b3

Original change: https://android-review.googlesource.com/c/platform/external/bsdiff/+/1535865

Change-Id: Ic0fd18ef5e6332b63ee680f032abe6ac4ad736cf