small fix for perf regression in GrAtlasTextContext

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 48 matching lines @@
         data->fData = userData;
     }
 
     /*
      * A class which can be handed back to GrBatchAtlas for updating in bulk last use tokens.  The
      * current max number of plots the GrBatchAtlas can handle is 32, if in the future this is
      * insufficient then we can move to a 64 bit int
      */
     class BulkUseTokenUpdater {
     public:
-        BulkUseTokenUpdater() : fPlotAlreadyUpdated(0), fCount(0), fAllocated(kMinItems) {}
+        BulkUseTokenUpdater() : fPlotAlreadyUpdated(0) {}
         void add(AtlasID id) {
             int index = GrBatchAtlas::GetIndexFromID(id);
             if (!this->find(index)) {
                 this->set(index);
             }
         }
 
         void reset() {
-            fPlotsToUpdate.reset(kMinItems);
-            fAllocated = kMinItems;
-            fCount = 0;
+            fPlotsToUpdate.reset();
             fPlotAlreadyUpdated = 0;
         }
 
     private:
         bool find(int index) const {
             SkASSERT(index < kMaxPlots);
             return (fPlotAlreadyUpdated >> index) & 1;
         }
 
         void set(int index) {
             SkASSERT(!this->find(index));
             fPlotAlreadyUpdated = fPlotAlreadyUpdated | (1 << index);
             fPlotsToUpdate.push_back(index);
         }
 
         static const int kMinItems = 4;
         static const int kMaxPlots = 32;
         SkSTArray<kMinItems, int, true> 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;
     }
@@ skipping 27 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