Add helper classes for reading and writing SDC files. am: b2d23dd55d

Original change: https://android-review.googlesource.com/c/platform/art/+/3539979

Change-Id: I4c254c6700affcf41c3bbd8805b96f4ef1f2b921
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>