Minor cleanup of SkLightingShader

src/ports/SkGlobalInitialization_default.cpp

Index: src/ports/SkGlobalInitialization_default.cpp
diff --git a/src/ports/SkGlobalInitialization_default.cpp b/src/ports/SkGlobalInitialization_default.cpp
index fb496f65cb8ab07967b5811ab7fe0021c8dd5189..47b00b96f16bfb7a2f6874f0a1e5ed5d0534e5c7 100644
--- a/src/ports/SkGlobalInitialization_default.cpp
+++ b/src/ports/SkGlobalInitialization_default.cpp
@@ -37,6 +37,7 @@
 #include "SkLayerRasterizer.h"
 #include "SkLerpXfermode.h"
 #include "SkLightingImageFilter.h"
+#include "../effects/SkLightingShader.h"
 #include "SkLocalMatrixShader.h"
 #include "SkLumaColorFilter.h"
 #include "SkMagnifierImageFilter.h"
@@ -111,6 +112,7 @@ public:
         SkColorFilter::InitializeFlattenables();
         SkGradientShader::InitializeFlattenables();
         SkLightingImageFilter::InitializeFlattenables();
+        SkLightingShader::InitializeFlattenables();
         SkTableColorFilter::InitializeFlattenables();
         SkXfermode::InitializeFlattenables();
     }