fix initialization order

Broke the linux build
with incorrectly ordered
construction initialization.

TBR=reed@google.com
BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2926

Change-Id: I2555616b945021cf119122811db0cfaf999834a0
Reviewed-on: https://skia-review.googlesource.com/2926
Reviewed-by: Cary Clark <caryclark@google.com>
1 file changed