take 2: create simple 'skpmaker' tool to generate SKP files for testing

take 2: create simple 'skpmaker' tool to generate SKP files for testing

(re-landing https://codereview.chromium.org/108343006 without the build breakages)

BUG=skia:1943
Committed: http://code.google.com/p/skia/source/detail?r=12866

[epoger, 2014-01-02 19:14:25]

patchset 1 is the change as it was in the original CL (causes warnings on some
compilers)

[epoger, 2014-01-02 19:25:58]

Please see the diffs between patchsets 1 and 2, and the different trybot results
for those two patchsets.

[rmistry, 2014-01-02 19:30:24]

LGTM

[commit-bot: I haz the power, 2014-01-02 19:30:53]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/epoger@google.com/112253004/40001

[commit-bot: I haz the power, 2014-01-02 19:42:17]

Change committed as 12866