Fix clip expansion in SkPictureRecord::recordRestoreOffsetPlaceholder()

Fix clip expansion in SkPictureRecord::recordRestoreOffsetPlaceholder()

For operations which can expand the region, zeroing previous clip ops' restore offsets is not enough: we need to also break the chain - otherwise the next restore() will simply traverse back and reset the skip offsets.

R=robertphillips@google.com

Committed: https://code.google.com/p/skia/source/detail?r=10934

[robertphillips, 2013-08-27 15:08:56]

lgtm + nits

https://codereview.chromium.org/22987003/diff/1/src/core/SkPictureRecord.cpp
File src/core/SkPictureRecord.cpp (right):

https://codereview.chromium.org/22987003/diff/1/src/core/SkPictureRecord.cpp#...
src/core/SkPictureRecord.cpp:731: 
Reset the pointer back to the previous clip so that ...

https://codereview.chromium.org/22987003/diff/1/tests/PictureTest.cpp
File tests/PictureTest.cpp (right):

https://codereview.chromium.org/22987003/diff/1/tests/PictureTest.cpp#newcode553
tests/PictureTest.cpp:553: 
// Comment
// This canvas ...

https://codereview.chromium.org/22987003/diff/1/tests/PictureTest.cpp#newcode560
tests/PictureTest.cpp:560: 
clipPath
fmalita's clipX
clipRRect

https://codereview.chromium.org/22987003/diff/1/tests/PictureTest.cpp#newcode570
tests/PictureTest.cpp:570: unsigned fClipCount;
inherited

[commit-bot: I haz the power, 2013-08-27 15:31:03]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/fmalita@chromium.org/22987003/11001

[commit-bot: I haz the power, 2013-08-27 15:45:30]

Retried try job too often on Build-Mac10.7-Clang-x86-Release-Trybot for step(s)
BuildMost
http://173.255.115.253:10117/buildstatus?builder=Build-Mac10.7-Clang-x86-Rele...

[f(malita), 2013-08-27 15:50:25]

Committed patchset #2 manually as r10934 (presubmit successful).