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Currently, when ui::mojo::Gpu interface is exposed by the Browser process
(kMash feature is not enabled), only the binding requests from the
Renderer processes are being handled.

For certain devices and applications, it is desirable to access the
ui::mojo::Gpu interface from a non-Renderer process, in order for that process
to access video encode/decode accelerators hosted in the GPU process.

This CL will allow other processes to bind to ui::mojom::Gpu interface
hosted by the Browser process (assuming allowed by the manifest), by
also handling ui::mojom::Gpu interface binding requests in
CommonBrowserInterface. The handling for ui::mojom::Gpu interface binding
requests from Renderer processes will stay the same.

Bug: 836874
Test: run content_browsertests
Change-Id: Ib1e3751d8c593a3c8d29096e7dc9cc609f6a1fa4
Reviewed-on: https://chromium-review.googlesource.com/1028556Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Peter Qiu <zqiu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564814}