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Ozone demo is intended to be the simplest possible program that uses the
ozone API to create a window and render to it. Porters use this to see if
their platform implements the API correctly without having to build or
run the entire browser.

Ozone demo recently started using skia infrastructure for rendering via
GL. However, this arguably makes the demo less useful to porters because
it is additional complexity that is not relevant to implementing the
platform window or rendering surface.

This splits the skia demo into a new executable and brings back the
"simple" renderer that just clears the screen to a solid color.

Bug: none
Test: ozone_demo, skia_demo
Change-Id: I8570d43949d68dcf87175c53057c7c72cf45ea6e
Reviewed-on: https://chromium-review.googlesource.com/1028579Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553721}