Break layout context before and after bidi control character

Bug: 170968514
Test: minikin_test
Change-Id: Ibcff6f3b7fcb7fefa2acb7f52446cf4b4547a4a2
Merged-In: Ibcff6f3b7fcb7fefa2acb7f52446cf4b4547a4a2
(cherry picked from commit b0473792a5a0d9d287f6995f27e867c074835a28)
(cherry picked from commit fcd1240acd2e9a14d7e6bf755f4bbdfda0928e06)
2 files changed