A few more small changes to make GrAtlasTextBlob nearly self contained

src/gpu/text/GrTextUtils.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextUtils.h"
 
 #include "GrAtlasTextBlob.h"
@@ skipping 218 matching lines @@
     }
 
     // Because there can be multiple runs in the blob, we want the overall maxMinScale, and
     // minMaxScale to make regeneration decisions.  Specifically, we want the maximum minimum scale
     // we can tolerate before we'd drop to a lower mip size, and the minimum maximum scale we can
     // tolerate before we'd have to move to a large mip size.  When we actually test these values
     // we look at the delta in scale between the new viewmatrix and the old viewmatrix, and test
     // against these values to decide if we can reuse or not(ie, will a given scale change our mip
     // level)
     SkASSERT(dfMaskScaleFloor <= scaledTextSize && scaledTextSize <= dfMaskScaleCeil);
-    blob->fMaxMinScale = SkMaxScalar(dfMaskScaleFloor / scaledTextSize, blob->fMaxMinScale);
-    blob->fMinMaxScale = SkMinScalar(dfMaskScaleCeil / scaledTextSize, blob->fMinMaxScale);
+    blob->setMinAndMaxScale(dfMaskScaleFloor / scaledTextSize, dfMaskScaleCeil / scaledTextSize);
 
     skPaint->setLCDRenderText(false);
     skPaint->setAutohinted(false);
     skPaint->setHinting(SkPaint::kNormal_Hinting);
     skPaint->setSubpixelText(true);
 }
 
 void GrTextUtils::DrawDfText(GrAtlasTextBlob* blob, int runIndex,
                              GrBatchFontCache* fontCache, const SkSurfaceProps& props,
                              const SkPaint& skPaint, GrColor color,
@@ skipping 279 matching lines @@
 
                 matrix[SkMatrix::kMTransX] = loc.fX;
                 matrix[SkMatrix::kMTransY] = loc.fY;
                 GrBlurUtils::drawPathWithMaskFilter(context, dc, clip, *path, paint,
                                                     viewMatrix, &matrix, clipBounds, false);
             }
         }
         pos += scalarsPerPosition;
     }
 }