Stop supporting HW dither

src/gpu/GrBlurUtils.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBlurUtils.h"
 #include "GrDrawContext.h"
 #include "GrCaps.h"
@@ skipping 179 matching lines @@
             // should I push prePathMatrix on our MV stack temporarily, instead
             // of applying it here? See SkDraw.cpp
             pathPtr->transform(*prePathMatrix, result);
             pathPtr = result;
         }
     }
     // at this point we're done with prePathMatrix
     SkDEBUGCODE(prePathMatrix = (const SkMatrix*)0x50FF8001;)
 
     GrPaint grPaint;
-    if (!SkPaint2GrPaint(context, renderTarget, paint, viewMatrix, true, &grPaint)) {
+    if (!SkPaint2GrPaint(context, paint, viewMatrix, true, &grPaint)) {
         return;
     }
 
     const SkRect* cullRect = nullptr;  // TODO: what is our bounds?
     if (!strokeInfo.isDashed() && pathEffect && pathEffect->filterPath(effectPath.init(), *pathPtr,
                                                                        &strokeInfo, cullRect)) {
         pathPtr = effectPath.get();
         pathIsMutable = true;
     }
 
@@ skipping 81 matching lines @@
                                                               SkPaint::kFill_Style;
         draw_with_mask_filter(drawContext, context->textureProvider(), renderTarget,
                               clip, viewMatrix, *devPathPtr,
                               paint.getMaskFilter(), clipBounds, &grPaint, style);
         return;
     }
 
     drawContext->drawPath(renderTarget, clip, grPaint, viewMatrix, *pathPtr, strokeInfo);
 }