Tweaking WebPageSerializerImpl to emit a BOM for UTF16/32.

third_party/WebKit/Source/wtf/text/TextCodecUTF16.cpp

 /*
  * Copyright (C) 2004, 2006, 2008, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 169 matching lines @@
     } else {
         for (size_t i = 0; i < length; ++i) {
             bytes[i * 2] = 0;
             bytes[i * 2 + 1] = characters[i];
         }
     }
 
     return result;
 }
 
+bool TextCodecUTF16::shouldIncludeBOM()
+{
+    // Always include BOM for UTF16.
+    return true;
+}
+
 } // namespace WTF