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This is in preparation for pushing favicons for pages out to the graph,
plus this exposes transient graph nodes reliably.

Change-Id: Iee06bcf2e87c2c28c4119b70a8b4ddb9b05ff943
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600362
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658769}