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Previously ChromeVox handled in-page links if you force-click on
them. This change makes it so that it also handles it if the user
presses Enter or mouse-clicks on a link, by responding to the
scrolledToAnchor event.

Testing this required enabling the test server because the browser
doesn't follow same-page links in data urls. Some of the work to
make use of the test server in ChromeVox tests was already done
for portals, but I had to fix a tiny bug in js2gtest.

how they're activated.

Bug: 1130786
AX-Relnotes: ChromeVox now properly handles in-page links no matter
Change-Id: I9e56f6c88fdbce35c14e692411cb7bb4a2e46db2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422704
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809223}