Don't crash if device creation fails in bench.

Don't crash if device creation fails in bench.

Committed: http://code.google.com/p/skia/source/detail?r=9417

[bsalomon, 2013-06-03 14:50:04]

The differ is doing a bad job. I just added the code to set declare setupFailed,
set it to true and print an error if device is NULL, and then indented a lot of
lines inside

if (!setupFailed) {
}

This should fix the Nexus S bench crashes.

[robertphillips, 2013-06-03 14:52:49]

lgtm

[commit-bot: I haz the power, 2013-06-03 17:03:10]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/bsalomon@google.com/16256011/3

[commit-bot: I haz the power, 2013-06-03 17:28:27]

Retried try job too often on Build-Mac10.7-Clang-x86-Release-Trybot for step(s)
BuildSkiaBaseLibs
http://108.170.217.252:10117/buildstatus?builder=Build-Mac10.7-Clang-x86-Rele...

[commit-bot: I haz the power, 2013-06-03 19:30:56]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/bsalomon@google.com/16256011/3

[commit-bot: I haz the power, 2013-06-03 19:31:09]

Change committed as 9417