Flate Test tests if compression works

Flate Test tests if compression works
-   Produce a compressable stream.
-   Assert compression ratio > 1
-   In verbose mode, print compression ratio.

Committed: https://skia.googlesource.com/skia/+/fbd3576a18799da88988ef26fa9bce09e8ebba37

[hal.canary, 2014-08-13 14:58:36]

The CQ bit was checked by halcanary@google.com

[hal.canary, 2014-08-13 14:58:50]

Fixed

[commit-bot: I haz the power, 2014-08-13 14:59:36]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/halcanary@google.com/464373002/1

[commit-bot: I haz the power, 2014-08-13 14:59:37]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from a valid reviewer till 2014-08-13 20:59 UTC

[mtklein, 2014-08-13 15:00:38]

lgtm

[commit-bot: I haz the power, 2014-08-13 15:07:45]

Committed patchset #1 (1) as fbd3576a18799da88988ef26fa9bce09e8ebba37