explicitly bump legacy genID on gpu surface

explicitly bump legacy genID on gpu surface

Previous attempt to "test" getTextureHandle was giving false-positive because we had an active image-snapshot, which was incidentally also triggering a new genID.

I think this CL will also enable this change: https://codereview.chromium.org/1222243002/

BUG=skia:
TBR=bsalomon@google.com
NOTREECHECKS=True

Committed: https://skia.googlesource.com/skia/+/dca20ce4e1a522d6f70c79252a169456b48619db

[reed2, 2015-07-03 03:23:42]

reed@chromium.org changed reviewers:
+ bsalomon@google.com

[reed2, 2015-07-03 03:23:43]

ptal

[reed2, 2015-07-03 03:23:49]

The CQ bit was checked by reed@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-07-03 03:23:54]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1208993008/20001

[reed2, 2015-07-03 03:24:25]

The CQ bit was unchecked by reed@chromium.org

[reed2, 2015-07-03 03:26:29]

reed@chromium.org changed reviewers:
+ reed@google.com

[reed2, 2015-07-03 14:20:27]

The CQ bit was checked by reed@chromium.org

[commit-bot: I haz the power, 2015-07-03 14:20:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1208993008/20001

[reed2, 2015-07-03 17:04:46]

The CQ bit was unchecked by reed@chromium.org

[reed2, 2015-07-03 17:04:52]

The CQ bit was checked by reed@chromium.org

[commit-bot: I haz the power, 2015-07-03 17:05:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1208993008/20001

[reed2, 2015-07-03 17:42:40]

The CQ bit was unchecked by reed@chromium.org

[reed2, 2015-07-03 17:42:58]

The CQ bit was checked by reed@chromium.org

[commit-bot: I haz the power, 2015-07-03 17:43:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1208993008/20001

[commit-bot: I haz the power, 2015-07-03 17:43:46]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/dca20ce4e1a522d6f70c79252a169456b48619db

[bsalomon, 2015-07-06 14:04:58]

lgtm