Regenerate LCD text blobs if GrPaint's color changes, not SkPaint.

src/gpu/GrAtlasTextBlob.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrAtlasTextBlob_DEFINED
 #define GrAtlasTextBlob_DEFINED
 
@@ skipping 166 matching lines @@
     // all glyph / vertex offsets are into these pools.
     unsigned char* fVertices;
     GrGlyph** fGlyphs;
     Run* fRuns;
     GrMemoryPool* fPool;
     SkMaskFilter::BlurRec fBlurRec;
     StrokeInfo fStrokeInfo;
     SkTArray<BigGlyph> fBigGlyphs;
     Key fKey;
     SkMatrix fViewMatrix;
-    SkColor fPaintColor;
+    GrColor fPaintColor;
     SkScalar fX;
     SkScalar fY;
 
     // We can reuse distance field text, but only if the new viewmatrix would not result in
     // a mip change.  Because there can be multiple runs in a blob, we track the overall
     // maximum minimum scale, and minimum maximum scale, we can support before we need to regen
     SkScalar fMaxMinScale;
     SkScalar fMinMaxScale;
     int fRunCount;
     uint8_t fTextType;
@@ skipping 36 matching lines @@
     void setHasDistanceField() { fTextType |= kHasDistanceField_TextType; }
     void setHasBitmap() { fTextType |= kHasBitmap_TextType; }
 
 #ifdef CACHE_SANITY_CHECK
     static void AssertEqual(const GrAtlasTextBlob&, const GrAtlasTextBlob&);
     size_t fSize;
 #endif
 };
 
 #endif