path ops : make it real

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
===================================================================
--- include/core/SkCanvas.h	(revision 8821)
+++ include/core/SkCanvas.h	(working copy)
@@ -381,6 +381,13 @@
         fAllowSoftClip = allow;
     }
 
+    /** EXPERIMENTAL -- only used for testing
+        Set to simplify clip stack using path ops.
+     */
+    void setAllowSimplifyClip(bool allow) {
+        fAllowSimplifyClip = allow;
+    }
+
     /** Modify the current clip with the specified region. Note that unlike
         clipRect() and clipPath() which transform their arguments by the current
         matrix, clipRegion() assumes its argument is already in device
@@ -1064,6 +1071,7 @@
     mutable SkRectCompareType fLocalBoundsCompareType;
     mutable bool              fLocalBoundsCompareTypeDirty;
     bool fAllowSoftClip;
+    bool fAllowSimplifyClip;
 
     const SkRectCompareType& getLocalClipBoundsCompareType() const {
         if (fLocalBoundsCompareTypeDirty) {
@@ -1074,6 +1082,7 @@
     }
     void computeLocalClipBoundsCompareType() const;
 
+
     class AutoValidateClip : ::SkNoncopyable {
     public:
         explicit AutoValidateClip(SkCanvas* canvas) : fCanvas(canvas) {