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This CL adds the TWA quality enforcement on 404 pages.
When the page is in scope(verified origin) is 404, it will show a toast
and run a CustomTabsCallback to notify the client app the issue.

This CL also changes one of the test pages in TrustedWebActivityTest.
The test was 404 because the test file is not included in the
chrome_public_test_apk package in chrome/android/BUILD.gn. So change
to another similar test page.

Bug: 1109609
Change-Id: I2dff19f115a4efc9f42c9acf7663a0b8988bf4dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311010
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792758}