Add missing file.

git-svn-id: http://skia.googlecode.com/svn/trunk@122 2bbb7eff-a529-9590-31e7-b0007b416f81

src/core/SkConcaveToTriangles.h

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+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SkConcaveToTriangles_DEFINED
+#define SkConcaveToTriangles_DEFINED
+
+#include "SkPoint.h"
+#include "SkTDArray.h"
+
+
+// Triangulate a polygon.
+// The polygon can be convex or concave, and can have holes or multiple contours
+// of arbitrary recursion.
+// The holes must have opposite orientation of the outer contours, whereas
+// islands within the holes must have the same orientation as the outer contour.
+// Contours should be joined by zero-thickness double-edges, to mimic a single
+// polygon.  The polygon should not be self-intersecting.
+// Currently, the outer contour must be right-handed, i.e. it should be oriented
+// in the direction that rotates the X-axis to the Y-axis.
+bool SkConcaveToTriangles(size_t count,
+                          const SkPoint pts[],
+                          SkTDArray<SkPoint> *triangles);
+
+
+#endif  // SkConcaveToTriangles_DEFINED