Add SkPathPriv::IsSimpleClosedRect

src/core/SkPathPriv.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPathPriv_DEFINED
 #define SkPathPriv_DEFINED
 
@@ skipping 65 matching lines @@
                     return false;
                 default: break;
             }
         }
         return false;
     }
 
     static void AddGenIDChangeListener(const SkPath& path, SkPathRef::GenIDChangeListener* listener) {
         path.fPathRef->addGenIDChangeListener(listener);
     }
+
+    /**
+     * This returns true for a rect that begins and ends at the same corner and has either a move
+     * followed by four lines or a move followed by 3 lines and a close. None of the parameters are
+     * optional. This does not permit degenerate line or point rectangles.
+     */
+    static bool IsSimpleClosedRect(const SkPath& path, SkRect* rect, SkPath::Direction* direction,
+                                   unsigned* start);
 };
 
 #endif