Revert of remove unused (by clients) SkUnitMapper

src/core/SkValidatingReadBuffer.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkErrorInternals.h"
 #include "SkValidatingReadBuffer.h"
@@ skipping 255 matching lines @@
             delete obj;
             obj = NULL;
         }
     } else {
         // we must skip the remaining data
         this->skip(sizeRecorded);
         SkASSERT(false);
     }
     return obj;
 }
-
-void SkValidatingReadBuffer::skipFlattenable() {
-    SkString name;
-    this->readString(&name);
-    if (fError) {
-        return;
-    }
-    uint32_t sizeRecorded = this->readUInt();
-    this->skip(sizeRecorded);
-}
-
-