Make GrBatchAtlas robust against attempts to add large rects.

src/gpu/GrBatchAtlas.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 GrBatchAtlas_DEFINED
 #define GrBatchAtlas_DEFINED
 
@@ skipping 223 matching lines @@
             return;
         }
 
         fPlotList.remove(plot);
         fPlotList.addToHead(plot);
     }
 
     inline void processEviction(AtlasID);
 
     GrTexture* fTexture;
+    int        fPlotWidth;
+    int        fPlotHeight;
     SkDEBUGCODE(uint32_t fNumPlots;)
 
     uint64_t fAtlasGeneration;
 
     struct EvictionData {
         EvictionFunc fFunc;
         void* fData;
     };
 
     SkTDArray<EvictionData> fEvictionCallbacks;
     // allocated array of GrBatchPlots
     SkAutoTUnref<BatchPlot>* fPlotArray;
     // LRU list of GrPlots (MRU at head - LRU at tail)
     GrBatchPlotList fPlotList;
 };
 
 #endif