Moved ambient lights out of SkLight's light array

samplecode/SampleLighting.cpp

Index: samplecode/SampleLighting.cpp
diff --git a/samplecode/SampleLighting.cpp b/samplecode/SampleLighting.cpp
index bab2b5df92270172e75a0099fe6a4245835f8a4e..2218f31022322d79c29c3063d5864a213f5fb6c1 100755
--- a/samplecode/SampleLighting.cpp
+++ b/samplecode/SampleLighting.cpp
@@ -22,7 +22,7 @@ static sk_sp<SkLights> create_lights(SkScalar angle, SkScalar blue) {
     SkLights::Builder builder;
 
     builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(1.0f, 1.0f, blue), dir));
-    builder.add(SkLights::Light::MakeAmbient(SkColor3f::Make(0.1f, 0.1f, 0.1f)));
+    builder.setAmbientLightColor(SkColor3f::Make(0.1f, 0.1f, 0.1f));
 
     return builder.finish();
 }