Update css styles after modifying display mode

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 762 matching lines @@
         m_inSynchronousPostLayout = true;
         performPostLayoutTasks();
         m_inSynchronousPostLayout = false;
     }
 
     bool wasResized = wasViewportResized();
     Document* document = m_frame->document();
 
     // Viewport-dependent media queries may cause us to need completely different style information.
     if (!document->styleResolver() || (wasResized && document->styleResolver()->mediaQueryAffectedByViewportChange())) {
-        document->styleResolverChanged();
         document->mediaQueryAffectingValueChanged();
     } else if (wasResized) {
         document->evaluateMediaQueryList();
     }
 
     document->updateLayoutTreeIfNeeded();
     lifecycle().advanceTo(DocumentLifecycle::StyleClean);
 
     if (m_frame->isMainFrame() && !m_viewportScrollableArea) {
         ScrollableArea& visualViewport = page()->frameHost().visualViewport();
@@ skipping 377 matching lines @@
     Node* node = object.node();
     ASSERT(node);
     if (isHTMLObjectElement(*node) || isHTMLEmbedElement(*node))
         toHTMLPlugInElement(node)->setNeedsWidgetUpdate(true);
 
     m_partUpdateSet.add(&object);
 }
 
 void FrameView::setDisplayMode(WebDisplayMode mode)
 {
+    if (mode == m_displayMode)
+        return;
+
     m_displayMode = mode;
+
     if (m_frame->document())
         m_frame->document()->mediaQueryAffectingValueChanged();
 }
 
 void FrameView::setMediaType(const AtomicString& mediaType)
 {
     ASSERT(m_frame->document());
     m_frame->document()->mediaQueryAffectingValueChanged();
     m_mediaType = mediaType;
 }
@@ skipping 2786 matching lines @@
 
     if (!graphicsLayer)
         return;
 
     DeprecatedPaintLayer::mapRectToPaintInvalidationBacking(localFrame->contentLayoutObject(), paintInvalidationContainer, viewRect);
 
     graphicsLayerTimingRequests.add(graphicsLayer, Vector<std::pair<int64_t, WebRect>>()).storedValue->value.append(std::make_pair(m_frame->frameID(), enclosingIntRect(viewRect)));
 }
 
 } // namespace blink