Implement a part of ProcessingInstruction by using PrivateScript

Source/core/frame/LocalDOMWindow.cpp

Index: Source/core/frame/LocalDOMWindow.cpp
diff --git a/Source/core/frame/LocalDOMWindow.cpp b/Source/core/frame/LocalDOMWindow.cpp
index 54eee0b21640a0177e665dc83cbf1aeaf6420452..3511b674527167eec00f7c0a97ca9438487daf40 100644
--- a/Source/core/frame/LocalDOMWindow.cpp
+++ b/Source/core/frame/LocalDOMWindow.cpp
@@ -35,6 +35,7 @@
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "bindings/core/v8/V8DOMActivityLogger.h"
+#include "bindings/core/v8/V8Document.h"
 #include "core/css/CSSComputedStyleDeclaration.h"
 #include "core/css/CSSRuleList.h"
 #include "core/css/DOMWindowCSS.h"
@@ -69,6 +70,7 @@
 #include "core/frame/Navigator.h"
 #include "core/frame/Screen.h"
 #include "core/frame/Settings.h"
+#include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/inspector/ConsoleMessageStorage.h"
@@ -1896,6 +1898,34 @@ PassOwnPtr<LifecycleNotifier<LocalDOMWindow> > LocalDOMWindow::createLifecycleNo
     return DOMWindowLifecycleNotifier::create(this);
 }
 
+void LocalDOMWindow::replaceDocument(String documentSource, String contentType, String encodingName)
+{
+    ASSERT(m_frame);
+    RefPtrWillBeRawPtr<Document> oldDocument(m_document);
+
+    DocumentInit init(oldDocument->url(), m_frame);
+
+    bool forceXHTML = contentType == "text/plain";
+
+    RefPtrWillBeRawPtr<Document> newDocument = installNewDocument(contentType, init, forceXHTML);
+
+    // Before parsing, we need to save & detach the old document and get the new document
+    // in place. We have to do this only if we're rendering the result document.
+    if (FrameView* view = m_frame->view())
+        view->clear();
+
+    newDocument->updateSecurityOrigin(oldDocument->securityOrigin());
+    newDocument->setCookieURL(oldDocument->cookieURL());
+    newDocument->contentSecurityPolicy()->copyStateFrom(oldDocument->contentSecurityPolicy());
+
+    DocumentEncodingData data;
+    data.setEncoding(WTF::TextEncoding(encodingName));
+    newDocument->setEncodingData(data);
+
+    V8Document::PrivateScript::setTransformSourceDocumentMethod(m_frame, newDocument.get(), oldDocument.get());
+    newDocument->setContent(documentSource);
+}
+
 void LocalDOMWindow::trace(Visitor* visitor)
 {
     visitor->trace(m_document);