add pathops tight bounds; conform path ops' gyp to unit tests

include/pathops/SkPathOps.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 SkPathOps_DEFINED
 #define SkPathOps_DEFINED
 
 #include "SkPreConfig.h"
 
 class SkPath;
+struct SkRect;
 
 // FIXME: move everything below into the SkPath class
 /**
   *  The logical operations that can be performed when combining two paths.
   */
 enum SkPathOp {
     kDifference_PathOp,         //!< subtract the op path from the first path
     kIntersect_PathOp,          //!< intersect the two paths
     kUnion_PathOp,              //!< union (inclusive-or) the two paths
     kXOR_PathOp,                //!< exclusive-or the two paths
@@ skipping 24 matching lines @@
 
     Returns true if operation was able to produce a result;
     otherwise, result is unmodified.
 
     @param path The path to simplify.
     @param result The simplified path. The result may be the input.
     @return True if simplification succeeded.
   */
 bool SK_API Simplify(const SkPath& path, SkPath* result);
 
+/** Set the resulting rectangle to the tight bounds of the path.
+
+    @param path The path measured.
+    @param result The tight bounds of the path.
+    @return True if the bounds could be computed.
+  */
+bool SK_API TightBounds(const SkPath& path, SkRect* result);
+
 #endif