Reland of change all factories to return their base-class

tests/PictureTest.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 "SkBBoxHierarchy.h"
 #include "SkBlurImageFilter.h"
 #include "SkCanvas.h"
@@ skipping 128 matching lines @@
 static void test_gpu_veto(skiatest::Reporter* reporter) {
     SkPictureRecorder recorder;
 
     SkCanvas* canvas = recorder.beginRecording(100, 100);
     {
         SkPath path;
         path.moveTo(0, 0);
         path.lineTo(50, 50);
 
         SkScalar intervals[] = { 1.0f, 1.0f };
-        SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0));
+        SkAutoTUnref<SkPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0));
 
         SkPaint paint;
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setPathEffect(dash);
 
         for (int i = 0; i < 50; ++i) {
             canvas->drawPath(path, paint);
         }
     }
     SkAutoTUnref<SkPicture> picture(recorder.endRecording());
@@ skipping 1219 matching lines @@
 
     SkAutoTDelete<SkStream> rstream(wstream.detachAsStream());
     SkAutoTUnref<SkPicture> deserializedPicture(SkPicture::CreateFromStream(rstream));
 
     REPORTER_ASSERT(r, SkToBool(deserializedPicture));
     REPORTER_ASSERT(r, deserializedPicture->cullRect().left() == 1);
     REPORTER_ASSERT(r, deserializedPicture->cullRect().top() == 2);
     REPORTER_ASSERT(r, deserializedPicture->cullRect().right() == 3);
     REPORTER_ASSERT(r, deserializedPicture->cullRect().bottom() == 4);
 }