This adds a checkbox to the debugger to allow seeing the effect pathops has on the clip. A new tab shows the C code that the pathops generate.

Once in place, this CL found a bug in the pathops code where it was not handling empty clip stack elements correctly. The Cl also has the change to SkCanvas to fix this bug.

R=robertphillips@google.com, reed@google.com

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/282283002

git-svn-id: http://skia.googlecode.com/svn/trunk@14774 2bbb7eff-a529-9590-31e7-b0007b416f81
12 files changed