Changed SkLightingShader API to take in a shader as color source

gm/lightingshader.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 "gm.h"
 
 #include "SkBitmapProcShader.h"
@@ skipping 80 matching lines @@
     void drawRect(SkCanvas* canvas, const SkRect& r, NormalMap mapType) {
 
         SkRect bitmapBounds = SkRect::MakeIWH(fDiffuse.width(), fDiffuse.height());
 
         SkMatrix matrix;
         matrix.setRectToRect(bitmapBounds, r, SkMatrix::kFill_ScaleToFit);
 
         const SkMatrix& ctm = canvas->getTotalMatrix();
 
         SkPaint paint;
+        sk_sp<SkShader> diffuseShader = SkMakeBitmapShader(fDiffuse,
+                SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, &matrix, nullptr);
         sk_sp<SkShader> normalMap = SkMakeBitmapShader(fNormalMaps[mapType],
                 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, &matrix, nullptr);
         sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(std::move(normalMap),
                                                                                ctm);
-        paint.setShader(SkLightingShader::Make(fDiffuse, fLights, &matrix,
-                                               std::move(normalSource)));
+        paint.setShader(SkLightingShader::Make(std::move(diffuseShader), std::move(normalSource),
+                                               fLights));
 
         canvas->drawRect(r, paint);
     }
 
     void onDraw(SkCanvas* canvas) override {
         SkMatrix m;
         SkRect r;
 
         {
             r = SkRect::MakeWH(SkIntToScalar(kTexSize), SkIntToScalar(kTexSize));
@@ skipping 53 matching lines @@
 
     sk_sp<SkLights> fLights;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new LightingShaderGM;)
 }