Add Frame::isMainFrame and deploy it

Source/core/frame/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 186 matching lines @@
         document()->prepareForDestruction();
     }
 
     if (m_view)
         m_view->unscheduleRelayout();
 
     eventHandler().clear();
 
     m_view = view;
 
-    if (m_view && m_page && m_page->mainFrame() == this)
+    if (m_view && isMainFrame())
         m_view->setVisibleContentScaleFactor(m_page->pageScaleFactor());
 }
 
 #if ENABLE(ORIENTATION_EVENTS)
 void Frame::sendOrientationChangeEvent(int orientation)
 {
     m_orientation = orientation;
     if (DOMWindow* window = domWindow())
         window->dispatchEvent(Event::create(EventTypeNames::orientationchange));
 }
@@ skipping 133 matching lines @@
     if (ownerElement()) {
         if (Document* doc = document())
             doc->topDocument()->clearAXObjectCache();
         ownerElement()->clearContentFrame();
         if (m_page)
             m_page->decrementSubframeCount();
     }
     m_frameInit->setOwnerElement(0);
 }
 
+bool Frame::isMainFrame() const
+{
+    return m_page && this == m_page->mainFrame();
+}
+
 String Frame::documentTypeString() const
 {
     if (DocumentType* doctype = document()->doctype())
         return createMarkup(doctype);
 
     return String();
 }
 
 String Frame::selectedText() const
 {
@@ skipping 57 matching lines @@
     return 0;
 }
 
 void Frame::createView(const IntSize& viewportSize, const Color& backgroundColor, bool transparent,
     ScrollbarMode horizontalScrollbarMode, bool horizontalLock,
     ScrollbarMode verticalScrollbarMode, bool verticalLock)
 {
     ASSERT(this);
     ASSERT(m_page);
 
-    bool isMainFrame = this == m_page->mainFrame();
+    bool isMainFrame = this->isMainFrame();
 
     if (isMainFrame && view())
         view()->setParentVisible(false);
 
     setView(0);
 
     RefPtr<FrameView> frameView;
     if (isMainFrame) {
         frameView = FrameView::create(this, viewportSize);
 
@@ skipping 91 matching lines @@
 
 void Frame::deviceOrPageScaleFactorChanged()
 {
     for (RefPtr<Frame> child = tree().firstChild(); child; child = child->tree().nextSibling())
         child->deviceOrPageScaleFactorChanged();
 }
 
 void Frame::notifyChromeClientWheelEventHandlerCountChanged() const
 {
     // Ensure that this method is being called on the main frame of the page.
-    ASSERT(m_page && m_page->mainFrame() == this);
+    ASSERT(isMainFrame());
 
     unsigned count = 0;
     for (const Frame* frame = this; frame; frame = frame->tree().traverseNext()) {
         if (frame->document())
             count += WheelController::from(frame->document())->wheelEventHandlerCount();
     }
 
     m_page->chrome().client().numWheelEventHandlersChanged(count);
 }
 
@@ skipping 115 matching lines @@
     if (!m_page)
         return 0;
 
     double ratio = m_page->deviceScaleFactor();
     if (RuntimeEnabledFeatures::devicePixelRatioIncludesZoomEnabled())
         ratio *= pageZoomFactor();
     return ratio;
 }
 
 } // namespace WebCore