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The changes to snav-testharness.js lets us assert navigations
in and out of iframes:

 1) To be able to test focus movements in and out of iframes,
    we need to listen for 'keyup'-events on the document where
    focus is _about_to_go_.

    'keyup' targets the currently focused document. When 'keyup'
    comes, 'keydown' has already changed focus to the new document.

 2) Previously each movement had its own async_test(). Now we use
    one async_test() with many "test steps": one for each movement.
    This helps us avoid tricky (mis)usage of testharness.js's
    fetch_tests_from_window().

The changes to the HTML files are mostly mechanical except that
I gave some elements new or renamed ids so they become easier
to distinguish when debugging.

Once we've fixed Issue 801162, the tests' expectations will change:
We want spatnav to first _focus_ the iframe (before scrolling it
or searching inside of it).

Bug: 803086, 891658, 801162
Change-Id: Ib53bb224398510b5744927a5d892381870fa4690
Reviewed-on: https://chromium-review.googlesource.com/c/1314469
Commit-Queue: Hugo Holgersson <hugoh@vewd.com>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#604962}