Use OzonePlatform for ozone-wayland

This implements OzonePlatformWayland and uses it to initialize
SurfaceFactoryOzone, EventFactoryOzone. Use supplement.gypi to add the
wayland platform to the chromium build.

This replaces the patch "Set Wayland as the implementation for
SurfaceFactoryOzone".
Merge pull request #115 from spang-chromium/use-ozoneplatform-for-wayland

Use OzonePlatform for ozone-wayland