Tweaking WebPageSerializerImpl to emit a BOM for UTF16/32.

third_party/WebKit/Source/web/WebPageSerializerImpl.cpp

Index: third_party/WebKit/Source/web/WebPageSerializerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebPageSerializerImpl.cpp b/third_party/WebKit/Source/web/WebPageSerializerImpl.cpp
index 3c933e1b6602a56648870521ec6f10c2e5881a80..b2a8a483f661c086297e79b0ebe8f030c92c04cf 100644
--- a/third_party/WebKit/Source/web/WebPageSerializerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebPageSerializerImpl.cpp
@@ -443,6 +443,10 @@ bool WebPageSerializerImpl::serialize()
         didSerialization = true;
 
         const WTF::TextEncoding& textEncoding = document->encoding().isValid() ? document->encoding() : UTF8Encoding();
+        if (textEncoding.isNonByteBasedEncoding()) {
+            const UChar byteOrderMark = 0xFEFF;
+            m_dataBuffer.append(byteOrderMark);
+        }
 
         SerializeDomParam param(url, textEncoding, document);