Start canonicalizing color for all A8 textblobs

include/core/SkTextBlob.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTextBlob_DEFINED
 #define SkTextBlob_DEFINED
 
@@ skipping 50 matching lines @@
 
         bool done() const;
         void next();
 
         uint32_t glyphCount() const;
         const uint16_t* glyphs() const;
         const SkScalar* pos() const;
         const SkPoint& offset() const;
         void applyFontToPaint(SkPaint*) const;
         GlyphPositioning positioning() const;
+        bool isLCD() const;
 
     private:
         const RunRecord* fCurrentRun;
         int              fRemainingRuns;
 
         SkDEBUGCODE(uint8_t* fStorageTop;)
     };
 
     SkTextBlob(int runCount, const SkRect& bounds);
 
@@ skipping 119 matching lines @@
 
     SkRect                 fBounds;
     int                    fRunCount;
     bool                   fDeferredBounds;
     size_t                 fLastRun; // index into fStorage
 
     RunBuffer              fCurrentRunBuffer;
 };
 
 #endif // SkTextBlob_DEFINED