GitLab

Add BackForwardCacheTestHelper class, which can check
whether a particular frame was disabled for a given
reason.

R=clamy@chromium.org,arthursonzogni@chromium.org
TBR=crharrison@chromium.org
CC=​​lowell@chromium.org,hajimehoshi@chromium.org,sreejakshetty@chromium.org,carlscab@google.com
BUG=1001087

Change-Id: I4e5b3649e412e3e4a6c97b572597958b02f1382e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833603
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703278}