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This CL adds a new flag parameter supported_features to BackForwardCache
feature. This parameter can specify the set of the features to be
allowed with back-forward cache. This enables us to enable the feature
remotely.

Bug: 1155449
Change-Id: Idb7eb55b114af688533ba2e069a9334714be725c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573850Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Fergal Daly <fergal@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835571}