Prepare for remote->local frame swap

Source/web/WebLocalFrameImpl.cpp

Index: Source/web/WebLocalFrameImpl.cpp
diff --git a/Source/web/WebLocalFrameImpl.cpp b/Source/web/WebLocalFrameImpl.cpp
index c508c7f825670dc38d164d6192373edcbba25fd8..8988239e1c609aed9246ed6863e6f2a6738c0351 100644
--- a/Source/web/WebLocalFrameImpl.cpp
+++ b/Source/web/WebLocalFrameImpl.cpp
@@ -205,6 +205,7 @@
 #include "web/WebDataSourceImpl.h"
 #include "web/WebDevToolsAgentPrivate.h"
 #include "web/WebPluginContainerImpl.h"
+#include "web/WebRemoteFrameImpl.h"
 #include "web/WebViewImpl.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/HashMap.h"
@@ -1803,6 +1804,20 @@ void WebLocalFrameImpl::loadJavaScriptURL(const KURL& url)
         frame()->loader().replaceDocumentWhileExecutingJavaScriptURL(scriptResult, ownerDocument.get());
 }
 
+void WebLocalFrameImpl::initializeToReplaceRemoteFrame(WebRemoteFrame* oldWebFrame)
+{
+    Frame* oldFrame = toCoreFrame(oldWebFrame);
+    OwnPtr<FrameOwner> tempOwner = adoptPtr(new PlaceholderFrameOwner());
+    m_frame = LocalFrame::create(&m_frameLoaderClientImpl, oldFrame->host(), tempOwner.get());
+    m_frame->setOwner(oldFrame->owner());
+    m_frame->tree().setName(oldFrame->tree().name());
+    setParent(oldWebFrame->parent());
+    // We must call init() after m_frame is assigned because it is referenced
+    // during init(). Note that this may dispatch JS events; the frame may be
+    // detached after init() returns.
+    m_frame->init();
+}
+
 void WebLocalFrameImpl::sendPings(const WebNode& linkNode, const WebURL& destinationURL)
 {
     ASSERT(frame());