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This CL adds an automated regression test that verifies that
an NTP-replacement extension:
    manifest.json:
        "chrome_url_overrides": {
            "newtab": "ext_ntp.html"
        },
    ext_ntp.html:
        <script src='ext_ntp.js'></script>
    ext_ntp.js:
        window.location = 'https://example.com'
will result in the new tab focusing its content (rather than the
location bar / omnibox).

Bug: 1029161
Change-Id: I08c188535ac85759a2380581c01a332bff329a7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946456
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723022}