add SkShader::newWithColorFilter

src/core/SkBlitter.cpp

 /*
  * Copyright 2006 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 "SkBlitter.h"
 #include "SkAntiRun.h"
 #include "SkColor.h"
 #include "SkColorFilter.h"
-#include "SkFilterShader.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkMask.h"
 #include "SkMaskFilter.h"
 #include "SkString.h"
 #include "SkTLazy.h"
 #include "SkUtils.h"
 #include "SkXfermode.h"
 #include "SkXfermodeInterpretation.h"
 
@@ skipping 828 matching lines @@
             // our color and move on.
             SkPaint* writablePaint = paint.writable();
             writablePaint->setColor(cf->filterColor(paint->getColor()));
             writablePaint->setColorFilter(nullptr);
             cf = nullptr;
         }
     }
 
     if (cf) {
         SkASSERT(shader);
-        shader = new SkFilterShader(shader, cf);
+        shader = shader->newWithColorFilter(cf);
         paint.writable()->setShader(shader)->unref();
         // blitters should ignore the presence/absence of a filter, since
         // if there is one, the shader will take care of it.
     }
 
     /*
      *  We create a SkShader::Context object, and store it on the blitter.
      */
     SkShader::Context* shaderContext = nullptr;
     if (shader) {
@@ skipping 102 matching lines @@
     fShaderContext->~Context();
     SkShader::Context* ctx = fShader->createContext(rec, (void*)fShaderContext);
     if (nullptr == ctx) {
         // Need a valid context in fShaderContext's storage, so we can later (or our caller) call
         // the in-place destructor.
         new (fShaderContext) SkZeroShaderContext(*fShader, rec);
         return false;
     }
     return true;
 }