harden and speed up path op unit tests

tests/PathOpsTestCommon.h

Index: tests/PathOpsTestCommon.h
diff --git a/tests/PathOpsTestCommon.h b/tests/PathOpsTestCommon.h
index 5072ad67aee4df8c15569a91b94e07508a40d082..78f2e9092c0fd972e879d63a19e7abb972c800e2 100644
--- a/tests/PathOpsTestCommon.h
+++ b/tests/PathOpsTestCommon.h
@@ -10,6 +10,16 @@
 #include "SkPathOpsQuad.h"
 #include "SkTArray.h"
 
+struct SkPathOpsBounds;
+
 void CubicToQuads(const SkDCubic& cubic, double precision, SkTArray<SkDQuad, true>& quads);
+bool ValidBounds(const SkPathOpsBounds&);
+bool ValidCubic(const SkDCubic& cubic);
+bool ValidLine(const SkDLine& line);
+bool ValidPoint(const SkDPoint& pt);
+bool ValidPoints(const SkPoint* pts, int count);
+bool ValidQuad(const SkDQuad& quad);
+bool ValidTriangle(const SkDTriangle& triangle);
+bool ValidVector(const SkDVector& v);
 
 #endif