API change to allow for NormalSource selection at the user level.

tests/SerializationTest.cpp

Index: tests/SerializationTest.cpp
diff --git a/tests/SerializationTest.cpp b/tests/SerializationTest.cpp
index 8acfcc202ed5a7da8f9ddfd6fed54a209d799de7..a3e2898eaa4da4ebe216d7d92d0afe496114e618 100644
--- a/tests/SerializationTest.cpp
+++ b/tests/SerializationTest.cpp
@@ -578,8 +578,10 @@ DEF_TEST(Serialization, reporter) {
         normals.allocN32Pixels(kTexSize, kTexSize);
 
         sk_tool_utils::create_frustum_normal_map(&normals, SkIRect::MakeWH(kTexSize, kTexSize));
-        sk_sp<SkShader> lightingShader = SkLightingShader::Make(diffuse, normals, fLights,
-                invNormRotation, &matrix, &matrix);
+        sk_sp<SkLightingShader::NormalSource> normalSource =
+                SkLightingShader::NormalMapSource::Make(normals, invNormRotation, &matrix);
+        sk_sp<SkShader> lightingShader = SkLightingShader::Make(diffuse, fLights, &matrix,
+                                                                std::move(normalSource));
 
         TestFlattenableSerialization(lightingShader.get(), true, reporter);
         // TODO test equality?