Don't serialize anything for SkEmptyShader.

gm/badpaint.cpp

Index: gm/badpaint.cpp
diff --git a/gm/badpaint.cpp b/gm/badpaint.cpp
index 45b17f85fe87ba0976a994faf5d8fed32d3894a9..cce81465ad400d9cc360a18810135376a97fc5d3 100644
--- a/gm/badpaint.cpp
+++ b/gm/badpaint.cpp
@@ -30,12 +30,10 @@ protected:
         SkMatrix badMatrix;
         badMatrix.setAll(0, 0, 0, 0, 0, 0, 0, 0, 0);
 
-#if 0 // This crashes pipe!
         // Empty bitmap.
         fPaints.push_back().setColor(SK_ColorGREEN);
         fPaints.back().setShader(SkShader::CreateBitmapShader(emptyBmp, SkShader::kClamp_TileMode,
                                                               SkShader::kClamp_TileMode))->unref();
-#endif
 
         // Non-invertible local matrix.
         fPaints.push_back().setColor(SK_ColorGREEN);