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ChromeOS without X11 will do display configuration and cursor
movement from the GPU process. This is the conduit for the messages
needed to make this work.

This plumbing also supports other platforms with similar requirements
(e.g. wayland's port). X11 does not need any specific messaging here,
since we just call the X server from the browser.

BUG=377497
TEST=content_shell --ozone-platform=egltest

Review URL: https://codereview.chromium.org/338193003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278465 0039d316-1c4b-4281-b951-d872f2087c98