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Below were some feedbacks from TAG
(https://github.com/w3ctag/design-reviews/issues/507):
1. Changed overlaygeometrychange event to geometrychange as it is fired
on the virtualKeyboard object.
2. Added boundingRect to virtualkeyboard object so web authors can query
whenever they want to know the last VK geometry values that was reported.

Bug: 856269

Change-Id: I7408133aa907fbf11d375c89417364059f2b3fc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2240458Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Anupam Snigdha <snianu@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#777563}