Make block size a template parameter of SkTLList

tools/skpdiff/SkDiffContext.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDiffContext_DEFINED
 #define SkDiffContext_DEFINED
 
@@ skipping 170 matching lines @@
         SkTArray<DiffData>        fDiffs;
     };
 
     // Used to protect access to fRecords and ensure only one thread is
     // adding new entries at a time.
     SkMutex fRecordMutex;
 
     // We use linked list for the records so that their pointers remain stable. A resizable array
     // might change its pointers, which would make it harder for async diffs to record their
     // results.
-    SkTLList<DiffRecord> fRecords;
+    typedef SkTLList<DiffRecord, 1> RecordList;
+    RecordList fRecords;
 
     SkImageDiffer** fDiffers;
     int fDifferCount;
     int fThreadCount;
 
     SkString fAlphaMaskDir;
     SkString fRgbDiffDir;
     SkString fWhiteDiffDir;
     bool longNames;
 };
 
 #endif