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This cl adds a setting to toggle the Launcher's 'Continue Reading' feature.

Bug: 843839, 872481
Test: manual.
Change-Id: I071e955194edcdf8f3184668b00f60fd8f2de71c
Reviewed-on: https://chromium-review.googlesource.com/1170317
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583482}