[TTS] Add new Blink tap-signals for ML.
Adds new feature signals from Blink about the page at the location tapped. These signals will be useful for deciding whether to trigger Contextual Search. Signals include the text run-length of the element tapped and the effective font size. BUG=754862 Change-Id: I02227479ecfae4d3b174a1845fed7c3d24e355b8 Reviewed-on: https://chromium-review.googlesource.com/920325Reviewed-by:Daniel Cheng <dcheng@chromium.org> Commit-Queue: Donn Denman <donnd@chromium.org> Cr-Commit-Position: refs/heads/master@{#543713}
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