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Migrate console logging from content hosted by a FrameImpl to use
per-Frame fx_loggers, rather than the //base LOG() macros.  Log messages
are tagged with the |debug_name| specified when the Frame was created,
if any.

Implement a SetConsoleLogSink() API to allow callers to redirect logging
on a per-Frame basis.

Bug: 1088094, 1051533, 1139396
Change-Id: I7c4d6b55fa34ba6e8a343d5830c91594eedcca7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517534
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836072}