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In order to have the feature accessible, all the actions using gestures
(long press, swipe to dismiss) must have custom accessibility actions.
Also adds action sheet to Read Later cells.

Bug: 749131
Change-Id: I2c81f6443a49bdf0cdccc3ec747b0ffd42513ef1
Reviewed-on: https://chromium-review.googlesource.com/593652
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Jean-François Geyelin <jif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490930}