Revert "don't compose with (forced) opaque colors"

This reverts commit 81995592d8a941fcf79ba5cee71a37510fa8d6e5.

Reason for revert: Various bots reporting "Processor ComposeTwo claimed output for const input doesn't match actual output"

Original change's description:
> don't compose with (forced) opaque colors
> 
> Bug: skia:
> Change-Id: Ic5ea706430b4698e7e937a0cc424ec29b0d8da10
> Reviewed-on: https://skia-review.googlesource.com/22029
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=bsalomon@google.com,brianosman@google.com,reed@google.com

Change-Id: Idf0e0db6e2d81dd00fa39c4ea0b3bcd92af8cae0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/22067
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
1 file changed