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Add logging for accessibility hit testing test flakiness

AccessibilityHitTestingBrowserTest.*WithPinchZoom are still flaking
after landing https://crrev.com/c/2140198. This CL adds more logging
on failure to help identify the problem.

Bug: 1069850, 1070647
Change-Id: I258b17e9b08614cfb5faf4d686f20994230a95a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149905Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#759743}