Merge "ImageDecoder: Use AssetFileDescriptor's length" am: efca2d56f1 am: 3a62413c4f am: b9d7c9ec52 am: 226c477959

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1426968

Change-Id: I6faeda10108c172c9cce080661ec4f40397fdc38