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This enables the table-based Reading List UI to be released with the
rest of the Phase 1 UI Refresh features.

This CL also updates Reading List EGTests to use a11y identifiers for
toolbar buttons rather than labels.  In the UI Refresh, the toolbar
buttons are based on UIBarButtonItems, which are rendered using
multiple views with the same a11y label.  Since EGTests couldn't find
matchers for the label, IDs are used instead.

Bug: 864378
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I223469771314907b614120a6b98f9bb92ce40b25
Reviewed-on: https://chromium-review.googlesource.com/1139901
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576156}