fix fuzzers

src/pathops/SkPathOpsRect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPathOpsRect_DEFINED
 #define SkPathOpsRect_DEFINED
 
 #include "SkPathOpsPoint.h"
@@ skipping 46 matching lines @@
         setBounds(curve, curve, 0, 1);
     }
 
     void setBounds(const SkDCubic& curve, const SkDCubic& sub, double tStart, double tEnd);
 
     void setBounds(const SkDQuad& curve) {
         setBounds(curve, curve, 0, 1);
     }
 
     void setBounds(const SkDQuad& curve, const SkDQuad& sub, double tStart, double tEnd);
+
+    bool valid() const {
+        return fLeft <= fRight && fTop <= fBottom;
+    }
 };
 
 #endif