Clip in grdrawtarget

src/gpu/GrClipMaskManager.h

Index: src/gpu/GrClipMaskManager.h
diff --git a/src/gpu/GrClipMaskManager.h b/src/gpu/GrClipMaskManager.h
index 20b7fdc0778ec923b669d4e74822dc9645b0cafd..cde718a605ceb760b617a4a2bac922adc6a56e78 100644
--- a/src/gpu/GrClipMaskManager.h
+++ b/src/gpu/GrClipMaskManager.h
@@ -50,6 +50,11 @@ public:
     struct ScissorState {
         ScissorState() : fEnabled(false) {}
         void set(const SkIRect& rect) { fRect = rect; fEnabled = true; }
+        bool operator==(const ScissorState& other) {
+            return fEnabled == other.fEnabled &&
+                    (false == fEnabled || fRect == other.fRect);
+        }
+        bool operator!=(const ScissorState& other) { return !(*this == other); }
         bool    fEnabled;
         SkIRect fRect;
     };