Changed SkLightingShader API to take in a shader as color source

samplecode/SampleLitAtlas.cpp

Index: samplecode/SampleLitAtlas.cpp
diff --git a/samplecode/SampleLitAtlas.cpp b/samplecode/SampleLitAtlas.cpp
index ba42ed8761ac9ad72fadd3f6514e2805f53359d8..f1882b789021743814b01375d2a4f638a80ae4a8 100644
--- a/samplecode/SampleLitAtlas.cpp
+++ b/samplecode/SampleLitAtlas.cpp
@@ -134,8 +134,10 @@ protected:
                     SkShader::kClamp_TileMode, &normalMat, nullptr);
             sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(
                     std::move(normalMap), m);
-            paint.setShader(SkLightingShader::Make(fAtlas, fLights, &diffMat,
-                                                   std::move(normalSource)));
+            sk_sp<SkShader> diffuseShader = SkBitmapProcShader::MakeBitmapShader(fAtlas,
+                    SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, &diffMat);
+            paint.setShader(SkLightingShader::Make(std::move(diffuseShader),
+                    std::move(normalSource), fLights));
 
             canvas->save();
                 canvas->setMatrix(m);