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This implements the blink portion of the API to
trigger a font chooser. This extends the previous stub
to communicate with the Browser process.

The content/embedder side will be extended in a future
CL to complete the implementation end-to-end.

Bug: 1138621
Change-Id: I0d5206b10566eed6a40227f994523cabaf3e0913
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538143
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Reviewed-by: Martin Barbella <mbarbella@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829904}