Add SkRecord::defrag().

src/core/SkRecord.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkRecord_DEFINED
 #define SkRecord_DEFINED
 
@@ skipping 93 matching lines @@
         SkASSERT(Existing::kType == fRecords[i].type());
         SkASSERT(proofOfAdoption == fRecords[i].ptr());
 
         return fRecords[i].set(this->allocCommand<T>());
     }
 
     // Does not return the bytes in any pointers embedded in the Records; callers
     // need to iterate with a visitor to measure those they care for.
     size_t bytesUsed() const;
 
+    // Rearrange and resize this record to eliminate any NoOps.
+    // May change count() and the indices of ops, but preserves their order.
+    void defrag();
+
 private:
     // An SkRecord is structured as an array of pointers into a big chunk of memory where
     // records representing each canvas draw call are stored:
     //
     // fRecords:  [*][*][*]...
     //             |  |  |
     //             |  |  |
     //             |  |  +---------------------------------------+
     //             |  +-----------------+                        |
     //             |                    |                        |
@@ skipping 65 matching lines @@
     int fCount, fReserved;
     SkAutoSTMalloc<kInlineRecords, Record> fRecords;
 
     // fAlloc needs to be a data structure which can append variable length data in contiguous
     // chunks, returning a stable handle to that data for later retrieval.
     SkVarAlloc fAlloc;
     char fInlineAlloc[1 << kInlineAllocLgBytes];
 };
 
 #endif//SkRecord_DEFINED