SkPicture: try to no-op away clone().

Will actually enable this by #defining SK_PICTURE_CLONE_NOOP in Chrome's SkUserConfig.h as a separate CL after this rolls in.

BUG=skia:
R=reed@google.com, robertphillips@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/447753003
1 file changed