fix cubic clip in y

gm/cubicpaths.cpp

Index: gm/cubicpaths.cpp
diff --git a/gm/cubicpaths.cpp b/gm/cubicpaths.cpp
index ca6c057ec02f70761252655659d2232b098b7fb2..e0f6933f17603fb699c9de048568e969634a8ef3 100644
--- a/gm/cubicpaths.cpp
+++ b/gm/cubicpaths.cpp
@@ -60,15 +60,15 @@ public:
 
 protected:
 
-    SkString onShortName() {
+    SkString onShortName() override {
         return SkString("clippedcubic2");
     }
 
-    SkISize onISize() { return SkISize::Make(1240, 390); }
+    SkISize onISize() override { return SkISize::Make(1240, 390); }
 
     void onDraw(SkCanvas* canvas) override {
         canvas->save();
-        canvas->translate(-2, 20);
+        canvas->translate(-2, 120);
         drawOne(canvas, fPath, SkRect::MakeLTRB(0, 0, 80, 150));
         canvas->translate(0, 170);
         drawOne(canvas, fPath, SkRect::MakeLTRB(0, 0, 80, 100));
@@ -77,6 +77,16 @@ protected:
         canvas->translate(0, 170);
         drawOne(canvas, fPath, SkRect::MakeLTRB(0, 0, 10, 150));
         canvas->restore();
+        canvas->save();
+        canvas->translate(20, -2);
+        drawOne(canvas, fFlipped, SkRect::MakeLTRB(0, 0, 150, 80));
+        canvas->translate(170, 0);
+        drawOne(canvas, fFlipped, SkRect::MakeLTRB(0, 0, 100, 80));
+        canvas->translate(170, 0);
+        drawOne(canvas, fFlipped, SkRect::MakeLTRB(0, 0, 150, 30));
+        canvas->translate(170, 0);
+        drawOne(canvas, fFlipped, SkRect::MakeLTRB(0, 0, 150, 10));
+        canvas->restore();
     }
 
     void drawOne(SkCanvas* canvas, const SkPath& path, const SkRect& clip) {
@@ -97,9 +107,18 @@ protected:
         fPath.cubicTo( 11.608591683531916f, 87.33115f, -0.010765133872116195f, 109.16448333333332f,
                 -0.013089005235602302f, 131);
         fPath.close();
+        fFlipped = fPath;
+        SkMatrix matrix;
+        matrix.reset();
+        matrix.setScaleX(0);
+        matrix.setScaleY(0);
+        matrix.setSkewX(1);
+        matrix.setSkewY(1);
+        fFlipped.transform(matrix);
     }
 
     SkPath fPath;
+    SkPath fFlipped;
 private:
     typedef skiagm::GM INHERITED;
 };