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 34bc016e83ca2780aa3ff3e6153ee8224a56a56b..fb0dd2ed9daf47877438037787533e571b217ddc 100644
--- a/third_party/WebKit/Source/web/WebPageSerializerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebPageSerializerImpl.cpp
@@ -163,11 +163,7 @@ String WebPageSerializerImpl::preActionBeforeSerializeOpenTag(
         if (!param->haveAddedXMLProcessingDirective) {
             param->haveAddedXMLProcessingDirective = true;
             // Get encoding info.
-            String xmlEncoding = param->document->xmlEncoding();
-            if (xmlEncoding.isEmpty())
-                xmlEncoding = param->document->encodingName();
-            if (xmlEncoding.isEmpty())
-                xmlEncoding = UTF8Encoding().name();
+            String xmlEncoding = param->textEncoding.name();
             result.appendLiteral("<?xml version=\"");
             result.append(param->document->xmlVersion());
             result.appendLiteral("\" encoding=\"");
@@ -462,7 +458,7 @@ bool WebPageSerializerImpl::serialize()
     if (url.isValid() && m_localLinks.contains(url.string())) {
         didSerialization = true;
 
-        const WTF::TextEncoding& textEncoding = document->encoding().isValid() ? document->encoding() : UTF8Encoding();
+        const WTF::TextEncoding& textEncoding = UTF8Encoding();
         String directoryName = url == mainURL ? m_localDirectoryName : "";
 
         SerializeDomParam param(url, textEncoding, document, directoryName);