Only use msaa target for blur mask when doAA is true

src/gpu/SkGpuDevice.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 "SkGpuDevice.h"
 
 #include "effects/GrBicubicEffect.h"
@@ skipping 618 matching lines @@
                      const SkRect& maskRect,
                      const SkPath& devPath,
                      const GrStrokeInfo& strokeInfo,
                      bool doAA,
                      GrAutoScratchTexture* mask,
                      int SampleCnt) {
     GrTextureDesc desc;
     desc.fFlags = kRenderTarget_GrTextureFlagBit;
     desc.fWidth = SkScalarCeilToInt(maskRect.width());
     desc.fHeight = SkScalarCeilToInt(maskRect.height());
-    desc.fSampleCnt = SampleCnt;
+    desc.fSampleCnt = doAA ? SampleCnt : 0;
     // We actually only need A8, but it often isn't supported as a
     // render target so default to RGBA_8888
     desc.fConfig = kRGBA_8888_GrPixelConfig;
 
     if (context->isConfigRenderable(kAlpha_8_GrPixelConfig,
                                     desc.fSampleCnt > 0)) {
         desc.fConfig = kAlpha_8_GrPixelConfig;
     }
 
     mask->set(context, desc);
@@ skipping 1210 matching lines @@
     GrLayerHoister::UnlockLayers(fContext->getLayerCache(), atlased, nonAtlased, recycled);
 
     return true;
 }
 
 SkImageFilter::Cache* SkGpuDevice::getImageFilterCache() {
     // We always return a transient cache, so it is freed after each
     // filter traversal.
     return SkImageFilter::Cache::Create(kDefaultImageFilterCacheSize);
 }