Have multiple plotmgrs, one for each mask format.

src/gpu/GrAtlas.h

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
@@ skipping 64 matching lines @@
         SkASSERT((unsigned)format < kCount_GrMaskFormats);
         return fTexture[format];
     }
 
     // to be called by ~GrAtlas()
     void freePlot(GrMaskFormat format, int x, int y);
 
 private:
     GrGpu*      fGpu;
     GrTexture*  fTexture[kCount_GrMaskFormats];
-    GrPlotMgr*  fPlotMgr;
+    GrPlotMgr*  fPlotMgr[kCount_GrMaskFormats];
 };
 
 #endif