Add unit test for crbug.com/570232

tests/BlurTest.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 "SkBlurDrawLooper.h"
@@ skipping 540 matching lines @@
             SkAutoTUnref<SkMaskFilter> mf(SkEmbossMaskFilter::Create(sigma, light));
             if (mf.get()) {
                 SkMaskFilter::BlurRec rec;
                 bool success = mf->asABlur(&rec);
                 REPORTER_ASSERT(reporter, !success);
             }
         }
     }
 }
 
+#if SK_SUPPORT_GPU
+
+// This exercises the problem discovered in crbug.com/570232. The return value from 
+// SkBlurMask::BoxBlur wasn't being checked in SkBlurMaskFilter.cpp::GrRRectBlurEffect::Create
+DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SmallBoxBlurBug, reporter, ctx) {
+
+    SkImageInfo info = SkImageInfo::MakeN32Premul(128, 128);
+    SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(ctx, SkSurface::kNo_Budgeted, info));
+    SkCanvas* canvas = surface->getCanvas();
+
+    SkRect r = SkRect::MakeXYWH(10, 10, 100, 100);
+    SkRRect rr = SkRRect::MakeRectXY(r, 10, 10);
+
+    SkPaint p;
+    p.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle, 0.01f))->unref();
+
+    canvas->drawRRect(rr, p);
+}
+
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////////////////