try adding flag to allow lcd text even in a layer

src/core/SkImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 640 matching lines @@
 void SkImageFilter::PurgeCache() {
     Cache::Get()->purge();
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 SkBaseDevice* SkImageFilter::DeviceProxy::createDevice(int w, int h) {
     SkBaseDevice::CreateInfo cinfo(SkImageInfo::MakeN32Premul(w, h),
                                    SkBaseDevice::kNever_TileUsage,
                                    kUnknown_SkPixelGeometry,
+                                   false,   /* preserveLCDText */
                                    true /*forImageFilter*/);
     SkBaseDevice* dev = fDevice->onCreateDevice(cinfo, nullptr);
     if (nullptr == dev) {
         const SkSurfaceProps surfaceProps(fDevice->fSurfaceProps.flags(),
                                           kUnknown_SkPixelGeometry);
         dev = SkBitmapDevice::Create(cinfo.fInfo, surfaceProps);
     }
     return dev;
 }
 
 bool SkImageFilter::DeviceProxy::filterImage(const SkImageFilter* filter, const SkBitmap& src,
                                        const SkImageFilter::Context& ctx,
                                        SkBitmap* result, SkIPoint* offset) {
     return fDevice->filterImage(filter, src, ctx, result, offset);
 }