Make XHR use the background HTML parser

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 866bdeda65440203d03980fc24b8636800b622c3..d697680b5a2b6b17e9972f719eddf958191cf2bb 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -182,6 +182,7 @@
 #include "core/svg/SVGTitleElement.h"
 #include "core/svg/SVGUseElement.h"
 #include "core/workers/SharedWorkerRepositoryClient.h"
+#include "core/xml/XMLHttpRequest.h"
 #include "core/xml/XSLTProcessor.h"
 #include "core/xml/parser/XMLDocumentParser.h"
 #include "platform/DateComponents.h"
@@ -4693,6 +4694,9 @@ void Document::finishedParsing()
 
     if (HTMLImportLoader* import = importLoader())
         import->didFinishParsing();
+
+    if (XMLHttpRequest* xhr = XMLHttpRequest::findInstancePendingDocumentParse(this))
+        xhr->didFinishParsingDocument();

[abarth-chromium, 2014/09/02 20:13:19]

Can we make this into a generic client interface instead of teaching this code
about all of its callers?

[kouhei (in TOK), 2014/09/03 03:23:50]

Got it. That makes more sense. Let me create a separate CL for it, and come back
to this CL after the interface is ready.

[kouhei (in TOK), 2014/09/09 22:14:40]

Done. Rewrote the patch to use the DocumentParserClient interface.

 }
 
 void Document::elementDataCacheClearTimerFired(Timer<Document>*)