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X11 header files are infamous for creating macros with common
names such as None, True, False, Status, Bool, ...

To save oursaves the mess that creates, they are now wrapped
in a header, ui/gfx/x/x11.h, which puts those symbols in the
x11 namespace and removes the global macros.

Bug: 782184
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I10a9acecb8e7adacd170d1080a411bc9d1e49f79
Reviewed-on: https://chromium-review.googlesource.com/806275Reviewed-by: Victor Miura <vmiura@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#521659}