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This change added width and height of the virtual keyboard rectangle
to the CSS environment variables reported in the geometrychange event
defined for VK.
This was a feedback from TAG review as well as from web devs who are
experimenting with VK APIs.
https://github.com/w3ctag/design-reviews/issues/507

Bug:1127746

Change-Id: Ib3eaefa4f92b5e7482f30c0c6643ccd470728a7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422701Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Anupam Snigdha <snianu@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#809346}