DirectWrite to use aliased if ClearType is empty.

src/core/SkGlyph.h

Index: src/core/SkGlyph.h
diff --git a/src/core/SkGlyph.h b/src/core/SkGlyph.h
index 5e0ac7ec0babff4d0dcd72cfae44f0922a588cbb..4290bb889d1d07945aa8b55798ce7a6ad8ccb95e 100644
--- a/src/core/SkGlyph.h
+++ b/src/core/SkGlyph.h
@@ -32,6 +32,7 @@ struct SkGlyph {
     void*       fDistanceField;
     uint8_t     fMaskFormat;
     int8_t      fRsbDelta, fLsbDelta;  // used by auto-kerning
+    int8_t      fForceBW;
 
     void init(uint32_t id) {
         fID             = id;
@@ -39,6 +40,7 @@ struct SkGlyph {
         fPath           = NULL;
         fDistanceField  = NULL;
         fMaskFormat     = MASK_FORMAT_UNKNOWN;
+        fForceBW        = 0;
     }
 
     /**