Revert "Revert "check for no blur and exit early""

This reverts commit 8825a09fc88f46dcec1d547dfbe7457ea224790b.

Bug: skia:
Change-Id: I01df7bf9e398012b5320655da3cab306256e31fb
Reviewed-on: https://skia-review.googlesource.com/25740
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
3 files changed