Revert[2] "use rasterpipeline for non-8888-clamp shaders (so we can delete more legacy code)""

Now with guard for Chrome and fix for bench
https://codereview.chromium.org/2947233002/

This reverts commit 19d0b99922712df3f07ba4622f1e5ccddc3b7168.

Bug: skia:
Change-Id: I5991955d0d927d34a184cf4d9844b0d565e03b88
Reviewed-on: https://skia-review.googlesource.com/20461
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
6 files changed