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This cl adds more descriptive text to ChromeVox when pronoucing the
suggestion chip of Continue Reading.

Bug: 843839, 865051
Test: manual.
Change-Id: I3b7bd36c1c69d43dcc79bde14ae0cbb1c6e78d66
Reviewed-on: https://chromium-review.googlesource.com/1176201Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584593}