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Support for opening a link in new tab/window exists using mouse. But
after setting focus over link by pressing Tab key, we do not have the
provision to open the link in new tab/window using keyboard shortcut.
This new API carries keyboard modifier value whenever URI action
needs to be performed.

Unit tests are added to validate the newly added API.

Bug: chromium:994500
Change-Id: Id7936c0ec42115f92a790f4d469f65c6194f9d1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154432Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Ian Prest <iapres@microsoft.com>
Commit-Queue: Badhri Ravikumar <bravi@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#760239}