Remove PaintLayerPaintingChildClippingMaskPhase.

Remove PaintLayerPaintingChildClippingMaskPhase.

It's never set. It was added in
https://chromium.googlesource.com/chromium/blink/+/7176977ba5087a97ef38b1a88d0e450e924404ca%5E%21/#F21

The test cases from that patch seem to pass.
Included one in this patch.

R=esprehn@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/7318146c229068ba7bd70f7af99e60fd9b45f60b

[esprehn, 2014-12-03 04:09:15]

esprehn@chromium.org changed reviewers:
+ esprehn@chromium.org

[esprehn, 2014-12-03 04:09:16]

lgtm, but without pixel tests it's hard to tell if that test really does
anything.

https://codereview.chromium.org/772193004/diff/1/sky/tests/clipping/canvas-ro...
File sky/tests/clipping/canvas-rounded-corners.sky (right):

https://codereview.chromium.org/772193004/diff/1/sky/tests/clipping/canvas-ro...
sky/tests/clipping/canvas-rounded-corners.sky:22: context.fillRect(0, 0,
theCanvas.width, theCanvas.width);
Did you load this and see if the canvas actually painted?

[ojan, 2014-12-03 04:11:45]

On 2014/12/03 at 04:09:16, esprehn wrote:
> lgtm, but without pixel tests it's hard to tell if that test really does
anything.

That's why I added the FIXME to make this a reftest. I have a patch in progress
(doesn't quite work yet) to enable reftests, but I needed an easy patch to have
a feeling of accomplishment today. :)

> 
>
https://codereview.chromium.org/772193004/diff/1/sky/tests/clipping/canvas-ro...
> File sky/tests/clipping/canvas-rounded-corners.sky (right):
> 
>
https://codereview.chromium.org/772193004/diff/1/sky/tests/clipping/canvas-ro...
> sky/tests/clipping/canvas-rounded-corners.sky:22: context.fillRect(0, 0,
theCanvas.width, theCanvas.width);
> Did you load this and see if the canvas actually painted?

Yes.

[ojan, 2014-12-03 04:12:28]

Committed patchset #1 (id:1) manually as
7318146c229068ba7bd70f7af99e60fd9b45f60b.