Add SkRecord::defrag().

tests/RecordTestUtils.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 RecordTestUtils_DEFINED
 #define RecordTestUtils_DEFINED
 
 #include "SkRecord.h"
 #include "SkRecords.h"
+#include "Test.h"
 
 // If the command we're reading is a U, set ptr to it, otherwise set it to nullptr.
 template <typename U>
 struct ReadAs {
     ReadAs() : ptr(nullptr), type(SkRecords::Type(~0)) {}
 
     const U* ptr;
     SkRecords::Type type;
 
     void operator()(const U& r) { ptr = &r; type = U::kType; }
@@ skipping 30 matching lines @@
     MatchType<DrawT> matcher;
     for (int i = 0; i < record.count(); i++) {
         if (record.visit<int>(i, matcher)) {
             return i;
         }
     }
     return -1;
 }
 
 #endif//RecordTestUtils_DEFINED