Move distance field text positioning into GrTextUtils

src/gpu/text/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 280 matching lines @@
     }
 
     // sets the last subrun of runIndex to use distance field text
     void setSubRunHasDistanceFields(int runIndex, bool hasLCD) {
         Run& run = fRuns[runIndex];
         Run::SubRunInfo& subRun = run.fSubRunInfo.back();
         subRun.setUseLCDText(hasLCD);
         subRun.setDrawAsDistanceFields();
     }
 
+    // inits the override descriptor on the current run.  All following subruns must use this
+    // descriptor
+    void initOverride(int runIndex) {
+        Run& run = fRuns[runIndex];
+        // Push back a new subrun to fill and set the override descriptor
+        run.push_back();
+        run.fOverrideDescriptor.reset(new SkAutoDescriptor);
+    }
+
     SkGlyphCache* setupCache(int runIndex,
                              const SkSurfaceProps& props,
                              const SkPaint& skPaint,
                              const SkMatrix* viewMatrix,
                              bool noGamma);
 
     // Appends a glyph to the blob.  If the glyph is too large, the glyph will be appended
     // as a path.
     void appendGlyph(int runIndex,
                      const SkRect& positions,
@@ skipping 82 matching lines @@
     void flushRunAsPaths(GrContext* context,
                          GrDrawContext* dc,
                          const SkSurfaceProps& props,
                          const SkTextBlobRunIterator& it,
                          const GrClip& clip, const SkPaint& skPaint,
                          SkDrawFilter* drawFilter, const SkMatrix& viewMatrix,
                          const SkIRect& clipBounds, SkScalar x, SkScalar y);
 };
 
 #endif