Use BBH reserve hook to preallocate space for tiles.

include/core/SkTDArray.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkTDArray_DEFINED
@@ skipping 329 matching lines @@
 
 #ifdef SK_DEBUG
     void validate() const {
         SkASSERT((fReserve == 0 && fArray == NULL) ||
                  (fReserve > 0 && fArray != NULL));
         SkASSERT(fCount <= fReserve);
         SkASSERT(fData == (ArrayT*)fArray);
     }
 #endif
 
+    void shrinkToFit() {
+        fReserve = fCount;
+        fArray = (T*)sk_realloc_throw(fArray, fReserve * sizeof(T));
+    }
+
 private:
 #ifdef SK_DEBUG
     enum {
         kDebugArraySize = 16
     };
     typedef T ArrayT[kDebugArraySize];
     ArrayT* fData;
 #endif
     T*      fArray;
     int     fReserve;
@@ skipping 20 matching lines @@
         fReserve = count + 4;
         fReserve += fReserve / 4;
         fArray = (T*)sk_realloc_throw(fArray, fReserve * sizeof(T));
 #ifdef SK_DEBUG
         fData = (ArrayT*)fArray;
 #endif
     }
 };
 
 #endif