optimization/fix: dirty the clip-bounds when we mod the clip in savelayer

optimization/fix: dirty the clip-bounds when we mod the clip in savelayer

Before the fix, we could use a stale cache of the clipbounds in quickReject. Often this could return false negatives, meaning we would try to draw more than we should (it would eventually be really clipped). Occasionally this could also report false positives (if the layer were outside of the normal canvas bounds, e.g. a layer with an offset imagefilter).

BUG=skia:
NOTREECHECKS=True

Committed: https://skia.googlesource.com/skia/+/9b3aa54bc9605257c701cf465813f5fb1d7ba39e

[reed1, 2015-03-11 15:19:38]

reed@google.com changed reviewers:
+ robertphillips@google.com

[reed1, 2015-03-11 15:19:43]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2015-03-11 15:19:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/983243003/1

[commit-bot: I haz the power, 2015-03-11 15:19:58]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-03-11 21:19 UTC

[robertphillips, 2015-03-11 15:35:14]

lgtm + nit

https://codereview.chromium.org/983243003/diff/1/src/core/SkCanvas.cpp
File src/core/SkCanvas.cpp (right):

https://codereview.chromium.org/983243003/diff/1/src/core/SkCanvas.cpp#newcod...
src/core/SkCanvas.cpp:833: bool SkCanvas::clipRectBounds(const SkRect* bounds,
SaveFlags flags,
extra space here ?

[reed1, 2015-03-11 15:41:37]

The CQ bit was checked by reed@google.com

[reed1, 2015-03-11 15:41:38]

The patchset sent to the CQ was uploaded after l-g-t-m from
robertphillips@google.com
Link to the patchset: https://codereview.chromium.org/983243003/#ps20001 (title:
"fix ws nit")

[commit-bot: I haz the power, 2015-03-11 15:41:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/983243003/20001

[commit-bot: I haz the power, 2015-03-11 15:47:16]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/9b3aa54bc9605257c701cf465813f5fb1d7ba39e