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This change allows Frame owners to opt-in to system console
logging for JS logs generated via console.log(), console.error(), etc.

Change-Id: I3a17fd6535d9b49ed676d15ab45104fa93a5a15c
Reviewed-on: https://chromium-review.googlesource.com/c/1327551
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606706}