Add implementation of path ops

tests/PathOpsTestCommon.cpp

+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "PathOpsTestCommon.h"
+#include "SkPathOpsCubic.h"
+
+void CubicToQuads(const SkDCubic& cubic, double precision, SkTDArray<SkDQuad>& quads) {
+    SkTDArray<double> ts;
+    cubic.toQuadraticTs(precision, &ts);
+    if (ts.count() <= 1) {
+        SkDQuad quad = cubic.toQuad();
+        *quads.append() = quad;
+        return;
+    }
+    double tStart = 0;
+    for (int i1 = 0; i1 <= ts.count(); ++i1) {
+        const double tEnd = i1 < ts.count() ? ts[i1] : 1;
+        SkDCubic part = cubic.subDivide(tStart, tEnd);
+        SkDQuad quad = part.toQuad();
+        *quads.append() = quad;
+        tStart = tEnd;
+    }
+}
+