Make a reftest for the flights app.

Make a reftest for the flights app.

This way we get some broad pixel test coverage.
Do this by dumping the png from the flights app,
uploading it to google storage and then having
the reference file load the uploaded file.

This isn't a good long-term solution. Long-term
we should dump paint commands (or some other
textual representation) and/or make more targetted
reftests that don't need pngs. As such, the process
for doing this is painful and manual. If we decide
we want to have pixel tests properly, we'll want
to do something more automated obviously.

Also, turn on the discard_transparency bool when
encoding the pngs. Otherwise, the png is lossy
and none of this works.

R=esprehn@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/9648321feeba9874fb0e829ba2864855badc7c46

[esprehn, 2015-01-07 19:29:55]

esprehn@chromium.org changed reviewers:
+ esprehn@chromium.org

[esprehn, 2015-01-07 19:29:56]

lgtm

[ojan, 2015-01-07 19:40:32]

Committed patchset #1 (id:1) manually as
9648321feeba9874fb0e829ba2864855badc7c46 (presubmit successful).