Pack BitmapTextBlob a bit tighter

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 84 matching lines @@
             } else {
                 // This case will almost never happen
                 fAllocated = fCount << 1;
                 fPlotsToUpdate.realloc(fAllocated);
                 fPlotsToUpdate[fCount++] = index;
             }
         }
 
         static const int kMinItems = 4;
         static const int kMaxPlots = 32;
+        SkAutoSTMalloc<kMinItems, int> fPlotsToUpdate;
         uint32_t fPlotAlreadyUpdated;
-        SkAutoSTMalloc<kMinItems, int> fPlotsToUpdate;
         int fCount;
         int fAllocated;
 
         friend class GrBatchAtlas;
     };
 
     void setLastUseTokenBulk(const BulkUseTokenUpdater& reffer, BatchToken);
 
 private:
     static int GetIndexFromID(AtlasID id) {
@@ skipping 24 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