Initial CL to create dummy GrShaderDataManager and thread it through

include/core/SkShader.h

Index: include/core/SkShader.h
diff --git a/include/core/SkShader.h b/include/core/SkShader.h
index 119da8766690d488064deaa9f9bcba793c3dd240..315d7a5680e3f41acf4d527e83cabcdc91eb8fd3 100644
--- a/include/core/SkShader.h
+++ b/include/core/SkShader.h
@@ -20,6 +20,7 @@ class SkPicture;
 class SkXfermode;
 class GrContext;
 class GrFragmentProcessor;
+class GrShaderDataManager;
 
 /** \class SkShader
  *
@@ -364,7 +365,7 @@ public:
      */
     virtual bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix& viewM,
                                      const SkMatrix* localMatrix, GrColor*,
-                                     GrFragmentProcessor**) const;
+                                     GrShaderDataManager*, GrFragmentProcessor**) const;
 
     /**
      *  If the shader can represent its "average" luminance in a single color, return true and