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Preparation for a follow-up CL that actually making queries for the font
lookup table asynchronous. In that CL, DWriteFontLookupTableBuilder
needs the task runner to run the Mojo message callback on the same task
runner on which DWriteFontProxyImpl received it.

Move scheduling the lookup table construction to
common_browser_interfaces.cc which is still around the same time in
startup as before, but makes it much easier to share the same task
runner.

Bug: 960263, 889864
Tbr: avi
Change-Id: I8be6d4a4d29014967d38f20ccf8a94948a7b8a1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626865
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663021}