Bug 1509369 - Add .git-blame-ignore-revs file. r=Ehsan

This file allows to ignore specific commits when using Google's hyper-blame utility

For now just contains mercurial commit 0ceae9db9ec0be18daa1a279511ad305723185d4 "Bug 1204606 - Reformat of dom/media r=jya"

abd6d77c is the cinnabar's SHA1
804b8b88 is the gecko-dev one.

Differential Revision: https://phabricator.services.mozilla.com/D12701

--HG--
extra : moz-landing-system : lando

.git-blame-ignore-revs

+# Bug 1204606 - Reformat of dom/media r=jya
+# https://hg.mozilla.org/mozilla-central/rev/0ceae9db9ec0be18daa1a279511ad305723185d4
+abd6d77c618998827e5ffc3dab12f1a34d6ed03d # cinnabar
+804b8b8883ba2a6795b0fcf65ebcb18306b6416b # gecko-dev