Handle paths that do not report empty, but have no edges.

tests/CanvasTest.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.
  */
 
 /*  Description:
  *      This test defines a series of elementatry test steps that perform
  *      a single or a small group of canvas API calls. Each test step is
@@ skipping 729 matching lines @@
 
     n = canvas.saveLayer(NULL, NULL);
     REPORTER_ASSERT(reporter, 2 == n);
     REPORTER_ASSERT(reporter, 3 == canvas.getSaveCount());
     
     canvas.restore();
     REPORTER_ASSERT(reporter, 2 == canvas.getSaveCount());
     canvas.restore();
     REPORTER_ASSERT(reporter, 1 == canvas.getSaveCount());
 }
+
+DEF_TEST(Canvas_ClipEmptyPath, reporter) {
+    SkCanvas canvas(10, 10);
+    canvas.save();
+    SkPath path;
+    canvas.clipPath(path);
+    canvas.restore();
+    canvas.save();
+    path.moveTo(5, 5);
+    canvas.clipPath(path);
+    canvas.restore();
+    canvas.save();
+    path.moveTo(7, 7);
+    canvas.clipPath(path);  // should not assert here
+    canvas.restore();
+}