[bfcache] Adding expectations to layout tests for bfcache-debug bots.

Adding the test expectation file for layout tests to linux-bfcache-debug
and adding a few filters.

Bug: 1010870, 976218
Change-Id: I2b9d41d4fe39ffb2c2d85f5ea91a6fe199d1cf19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837624
Reviewed-by: John Budorick <[email protected]>
Commit-Queue: Arthur Hemery <[email protected]>
Cr-Commit-Position: refs/heads/master@{#702762}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index c8954ca..d6c0fcc 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -1812,6 +1812,7 @@
         'args': [
           '--debug',
           '--additional-driver-flag=--enable-features=BackForwardCache',
+          '--additional-expectations=../../third_party/blink/web_tests/FlagExpectations/enable-features=BackForwardCache',
         ],
       },
       'linux-blink-animation-use-time-delta': {