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Javascript can only be invoked from the UI thread, so call over to the
UI thread before sending CRSBLOG messages to the WebUI. This also fixes
a bug where, if messages were sent before the WebUI had fully
initialized, we would fail to execute the Javascript, causing a CHECK
failure.

Bug: 952333
Change-Id: I0b3a5eb90f8993c6e19d52179b727e8784139bcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1566618Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650532}