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Testing on Cluster Telemetry with Linux found an issue where SkFontMgr
wasn't initialized properly resulting in inability to start the
compositor. This is due to the lack of font access since we didn't
call EnsureBlinkInitializedWithSandbox. However, the compositor only
needs a fraction of the features that come with that call. This CL
starts the font_service which enables the SkFontMgr to initialize. Note
that we don't require WebSandboxSupport to be initialized (at least for
Linux) as all the fonts are stored in the provided SkPictures.

Test coverage for this will be added as part of the end-to-end tests
for the player. That should catch any issues with other platforms.

Bug: 1023377
Change-Id: I95a224f6f3759b1b8f8df2989222757ebbd4f12e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1908062
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718149}