Implement WebFrame::swap.

Source/web/WebFrame.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "public/web/WebFrame.h"
 
 #include "web/OpenedFrameTracker.h"
+#include <algorithm>
+
 
 namespace blink {
 
+void WebFrame::swap(WebFrame* frame)
+{
+    using std::swap;
+
+    if (m_parent) {
+        if (m_parent->m_firstChild == this)

[eseidel, 2014/05/08 00:13:01]

I probably would have written a overrideIfSetTo(m_parent->m_firstChild, this,
newFrame) helper, but it also may not be worth the 5 saved lines either.

[dcheng, 2014/05/08 01:54:18]

Yeah I think it may not be worth it at the moment.

+            m_parent->m_firstChild = frame;
+        if (m_parent->m_lastChild == this)
+            m_parent->m_lastChild = frame;
+        swap(m_parent, frame->m_parent);
+    }
+    if (m_previousSibling) {
+        m_previousSibling->m_nextSibling = frame;
+        swap(m_previousSibling, frame->m_previousSibling);
+    }
+    if (m_nextSibling) {
+        m_nextSibling->m_previousSibling = frame;
+        swap(m_nextSibling, frame->m_nextSibling);
+    }
+    if (m_opener) {
+        m_opener->m_openedFrameTracker->remove(this);
+        m_opener->m_openedFrameTracker->add(frame);
+        swap(m_opener, frame->m_opener);
+    }
+    if (!m_openedFrameTracker->isEmpty()) {
+        m_openedFrameTracker->updateOpener(frame);
+        frame->m_openedFrameTracker.reset(m_openedFrameTracker.release());
+    }
+}
+
 WebFrame* WebFrame::opener() const
 {
     return m_opener;
 }
 
 void WebFrame::setOpener(WebFrame* opener)
 {
     if (m_opener)
         m_opener->m_openedFrameTracker->remove(this);
     if (opener)
@@ skipping 77 matching lines @@
     , m_openedFrameTracker(new OpenedFrameTracker)
 {
 }
 
 WebFrame::~WebFrame()
 {
     m_openedFrameTracker.reset(0);
 }
 
 } // namespace blink