No need to cache local matrix in picture shader.

Now that the local matrix cannot be changed, we no longer need
to keep track of it to regenerate the bitmap shader.

Depends on https://codereview.chromium.org/379323002

R=fmalita@google.com, fmalita@chromium.org

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/387043002
2 files changed