Try to avoid vertex colors in Texture/FillRect ops when possible.

Avoids unnecessary fragment shader color multiplication.

Change-Id: I353d3ca91824ce20c9e9af1c5c84ab9953ddd8ab
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201004
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
4 files changed