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When navigating to #foo, the element with id="foo" is scrolled into view
and is focused if focusable. This patch makes it receive the caret too,
in case caret browsing is enabled.

Bug: 1011934

TEST=editing/caret/caret-browsing-fragment-anchor.html

Change-Id: I044e6b48545426afdb0c5ee766d4ee3a218aa95b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463308
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843064}