Add factory class for generating various flavors of GrTextContext.

src/gpu/GrDistanceFieldTextContext.cpp

Index: src/gpu/GrDistanceFieldTextContext.cpp
diff --git a/src/gpu/GrDistanceFieldTextContext.cpp b/src/gpu/GrDistanceFieldTextContext.cpp
index 95e773ec651f86e4c54be3d285f5c767311eeaab..4c9631e1462cbbaeee4b4e9d0b6f757d06a1633b 100755
--- a/src/gpu/GrDistanceFieldTextContext.cpp
+++ b/src/gpu/GrDistanceFieldTextContext.cpp
@@ -28,8 +28,7 @@ SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false,
 GrDistanceFieldTextContext::GrDistanceFieldTextContext(GrContext* context,
                                                        const GrPaint& grPaint,
                                                        const SkPaint& skPaint)
-                                                     : GrTextContext(context, grPaint),
-                                                       fSkPaint(skPaint) {
+                                                     : GrTextContext(context, grPaint, skPaint) {
     fStrike = NULL;
 
     fCurrTexture = NULL;