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With this change, passing --debug-rwt-logging to run_web_tests.py will
cause base.py to print the difference for a failing reftest to the
console. A better solution would be to parse the data from image_diff
and pass it back up the stack to be embedded in the results, but this
approach is quick and works.

Bug: 997202
Change-Id: I541110cdafa18287fc47856c71a2c41427cf297d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575455Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834473}