Add dest type hint to SkShader::ContextRec

bench/SkLinearBitmapPipelineBench.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <memory>
 #include "SkColor.h"
 #include "SkLinearBitmapPipeline.h"
@@ skipping 178 matching lines @@
 
     }
 
     void onDraw(int loops, SkCanvas*) override {
         int width = fSrcSize.fWidth;
         int height = fSrcSize.fHeight;
 
         SkAutoTMalloc<SkPMColor> buffer4b(width*height);
 
         uint32_t storage[200];
-        const SkShader::ContextRec rec(fPaint, fM, nullptr);
+        const SkShader::ContextRec rec(fPaint, fM, nullptr,
+                                       SkShader::ContextRec::kPMColor_DstType);
         SkASSERT(fPaint.getShader()->contextSize(rec) <= sizeof(storage));
         SkShader::Context* ctx = fPaint.getShader()->createContext(rec, storage);
 
         int count = 100;
 
         for (int n = 0; n < 1000*loops; n++) {
             ctx->shadeSpan(3, 6, buffer4b, count);
         }
 
         ctx->~Context();
@@ skipping 77 matching lines @@
     SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);)
 
 DEF_BENCH(return new SkBitmapFPGeneral(
     srcSize, kLinear_SkColorProfileType, mR, true,
     SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);)
 
 DEF_BENCH(return new SkBitmapFPOrigShader(
     srcSize, kLinear_SkColorProfileType, mR, true,
     SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);)