Make sure SkDrawLooper objects can only be allocated on the heap.

tests/PaintTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
 #include "SkLayerDrawLooper.h"
@@ skipping 129 matching lines @@
     }
 }
 
 DEF_TEST(Paint_copy, reporter) {
     SkPaint paint;
     // set a few member variables
     paint.setStyle(SkPaint::kStrokeAndFill_Style);
     paint.setTextAlign(SkPaint::kLeft_Align);
     paint.setStrokeWidth(SkIntToScalar(2));
     // set a few pointers
-    SkLayerDrawLooper* looper = new SkLayerDrawLooper();
+    SkLayerDrawLooper::Builder looperBuilder;
+    SkLayerDrawLooper* looper = looperBuilder.detachLooper();
     paint.setLooper(looper)->unref();
     SkMaskFilter* mask = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
                                       SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(1)));
     paint.setMaskFilter(mask)->unref();
 
     // copy the paint using the copy constructor and check they are the same
     SkPaint copiedPaint = paint;
     REPORTER_ASSERT(reporter, paint == copiedPaint);
 
 #ifdef SK_BUILD_FOR_ANDROID
@@ skipping 110 matching lines @@
     ASSERT(other.getTextScaleX() == paint.getTextScaleX());
     ASSERT(other.getTextSize()   == paint.getTextSize());
     ASSERT(other.getLooper()     == paint.getLooper());
 
     // We have to be a little looser and compare just the modes.  Pointers might not be the same.
     SkXfermode::Mode otherMode, paintMode;
     ASSERT(other.getXfermode()->asMode(&otherMode));
     ASSERT(paint.getXfermode()->asMode(&paintMode));
     ASSERT(otherMode == paintMode);
 }