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The back-forward cache is a content/ layer feature and it is tested on
this layer. For instance, this file contains a lot of tests:
content/browser/back_forward_cache_browsertest.cc

We also want to have some basic tests at the chrome layer to catch
trivial regressions. In particular, there is now an API available to
chrome/ to disable the BackForwardCache on arbitrary page. See:
https://docs.google.com/document/d/1NjZeusdS1kyEkZyfLggndU1A6qVt0Y1sa-LRUxnMoK8

Bug: 1010932
Change-Id: Ic0f0fc667f0d1de5157f95aea5f0558bc3d8557d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1836413Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703719}