Fix for VALGRIND DrawAtlas test issue.

Fix for VALGRIND DrawAtlas test issue.

Don't pre-alloc color array.

Committed: https://skia.googlesource.com/skia/+/1acf250f922a547018bab25676d63f3bb090be71

[jvanverth1, 2015-08-13 17:04:45]

jvanverth@google.com changed reviewers:
+ bsalomon@google.com

[robertphillips, 2015-08-13 18:22:49]

robertphillips@google.com changed reviewers:
+ robertphillips@google.com

[robertphillips, 2015-08-13 18:22:50]

lgtm

[robertphillips, 2015-08-13 18:23:02]

The CQ bit was checked by robertphillips@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-08-13 18:23:17]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289003002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289003002/1

[commit-bot: I haz the power, 2015-08-13 18:30:30]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-13 18:30:31]

Dry run: This issue passed the CQ dry run.

[jvanverth1, 2015-08-13 18:52:40]

The CQ bit was checked by jvanverth@google.com

[commit-bot: I haz the power, 2015-08-13 18:52:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1289003002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1289003002/1

[commit-bot: I haz the power, 2015-08-13 18:53:41]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/1acf250f922a547018bab25676d63f3bb090be71

[bsalomon, 2015-08-13 19:00:34]

On 2015/08/13 18:30:31, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

In general, calling begin() on SkTArray is not guaranteed to return NULL. That
is probably it's own issue in and of itself, but I think here you probably need
to check hasColors.