Moved ambient lights out of SkLight's light array

gm/lightingshader.cpp

Index: gm/lightingshader.cpp
diff --git a/gm/lightingshader.cpp b/gm/lightingshader.cpp
index 4a79ebea1d9bbd6f72f5ad23eec0d5560c691395..137fd64a26caf68cd3176e8b52fc531e48a32863 100644
--- a/gm/lightingshader.cpp
+++ b/gm/lightingshader.cpp
@@ -52,7 +52,7 @@ public:
                                                      SkVector3::Make(SK_ScalarRoot2Over2,
                                                                      0.0f,
                                                                      SK_ScalarRoot2Over2)));
-        builder.add(SkLights::Light::MakeAmbient(SkColor3f::Make(0.2f, 0.2f, 0.2f)));
+        builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f));
 
         fLights = builder.finish();
     }