This change ports the decoder portion of the arc codec-tests [1] into
an Android application. The codec-test source is copied with minimal
changes - just renaming some header includes, replacing main() with a
RunDecoderTests function, removing most references to 'arc', and auto
formatting. The new code is the Android activity and the jni glue.

This change also enables presubmit format hooks for java and fixes a
typo in the clang_format hook configuration.

[1] https://chromium.googlesource.com/chromiumos/platform2/+/57c0c80bdb0d671f4fb2293c4c5fa7b5ed9dddf0/arc/codec-test/

Test: existing decoder tests pass when following instructions in readme
Bug: 142423642
Bug: 143584325
Bug: 144681449

Change-Id: I31e02cae5c10bb9936769c75efafe1fa9971bdbb
(cherry picked from commit 46344d0a85479760c5294f21de2efc106ab54048)