Some simple optimizations for improving GrAtlasTextContext perf

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 94 matching lines @@
         SkAutoSTMalloc<kMinItems, int> fPlotsToUpdate;
         uint32_t fPlotAlreadyUpdated;
         int fCount;
         int fAllocated;
 
         friend class GrBatchAtlas;
     };
 
     void setLastUseTokenBulk(const BulkUseTokenUpdater& reffer, BatchToken);
 
+    static const int kGlyphMaxDim = 256;
+    static bool GlyphTooLargeForAtlas(int width, int height) {
+        return width > kGlyphMaxDim || height > kGlyphMaxDim;
+    }
+
 private:
     static int GetIndexFromID(AtlasID id) {
         return id & 0xffff;
     }
 
     static int GetGenerationFromID(AtlasID id) {
         return (id >> 16) & 0xffff;
     }
 
     inline void updatePlot(GrBatchTarget*, AtlasID*, BatchPlot*);
@@ skipping 16 matching lines @@
     };
 
     SkTDArray<EvictionData> fEvictionCallbacks;
     // allocated array of GrBatchPlots
     SkAutoTUnref<BatchPlot>* fPlotArray;
     // LRU list of GrPlots (MRU at head - LRU at tail)
     GrBatchPlotList fPlotList;
 };
 
 #endif