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In this CL, we register listener for content editable element
including <input> and <textarea> elements.

This is used to notify that the browser side that there will be a
handler for touchstart event, so it needs to send the event to the
renderer.

Please refer to the bug for more information about the overall design.

Bug: 1126778
Change-Id: I35457d5f1ca02c943b5bf594c06a6a70e2c6e3bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401786
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808475}