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When user tabs over links and invokes context menu using Shift + F10,
link related context menu items are not shown since link url under
cursor value isn't set. This CL finds out the link url from the focused
annotation and updates link under cursor value.
Added unit test to test link under cursor value whenever focused
annotation changes.

Bug: chromium:994500
Change-Id: Iedb5db7fafcaeb47d1e1e5094b5f7e0553260cbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2173855
Commit-Queue: Badhri Ravikumar <bravi@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#768912}