Renderer can now be given a DisplayInfo that contains some
important information about the current display. This will be used
for frame-pacing and dynamic-resolution.
This is most relevant on Android, where we can accurately query these
parameters. Added support for that in our samples.
This also sets the minSDK to 19 (including gltf viewer's), since this is
the version we support. We were cheating before by under-reporting our
minSdk.
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