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Currently any exceptions thrown in an async test function are not caught
and the test will fail as a timeout.

Added fix for GalleryJsTest.ImageViewTest which was throwing exceptions
with undeclared metrics.record... functions.

TBR=fukino@chromium.org

Change-Id: I40ed5ff91a35ffd9a1c399d4d8405554e3fab911
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459136
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816044}