check texture is not NULL to aovid segmentation fault.

check texture is not NULL to aovid segmentation fault. If the texture created by GrLockAndRefCachedBitmapTexture() is NULL, ColorTableEffect::Create will cause segmentation fault by GrAssert in src/gpu/GrTextureAccess.cpp. The simple patch checked texture to avoid segment fault, and returned a NULL effect to the caller. The caller will handle NULL effect, for example, it will set default effect.

Committed: http://code.google.com/p/skia/source/detail?r=9287

[bsalomon, 2013-05-28 13:06:10]

On 2013/05/28 13:01:48, yunchao.he wrote:

lgtm. Thanks!

[commit-bot: I haz the power, 2013-05-28 13:06:22]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/yunchao.he@intel.com/15824003/1

[commit-bot: I haz the power, 2013-05-28 13:13:57]

Change committed as 9287