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This is [1] replicated over the fresh ToT.

There is a proxy class that ensures that GPU sends back correct visuals
on X11.  The class was declared in the anonymous namespace in the
content/browser/browser_main_loop.cc, which made it impossible to use
on Ozone.

This CL extracts the proxy and makes it available to use through the
PlatformGLEGLUtility interface.

In addition, the obsolete VisualID type used in gfx::GpuExtraInfo is
replaced with the x11::VisualId.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2252102

Bug: 789065
Change-Id: I6390ef8bc89cf118944be42fde78fd64a6c3d36d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2562182Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/master@{#837069}