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This CL tries to track down the flakiness of the following tests:
- SavePageOriginalVsSavedComparisonTest.ObjectElementsViaHttp
- SavePageOriginalVsSavedComparisonTest.CrossSiteObject
where the test will sometimes/flakily see that all the expected frames
are present, but find-in-page will fail to find text that is expected to
be found in one of the subframes.

After this CL, we should be able to verify if the problematic subframe
has finished loading - if it executed `window.name = ...` or not.

Bug: 1070597, 1070886
Change-Id: I7d499cbb228663b63030fac7dab37140b7c9be7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510913Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824222}