Webkit setting for embedders that do not support fullscreen.

Source/core/dom/FullscreenElementStack.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 15 matching lines @@
  */
 
 #include "config.h"
 #include "core/dom/FullscreenElementStack.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLFrameOwnerElement.h"
+#include "core/html/HTMLMediaElement.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/rendering/RenderFullScreen.h"
 #include "platform/UserGestureIndicator.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 static bool fullscreenIsAllowedForAllOwners(const Document& document)
@@ skipping 157 matching lines @@
         }
 
         // This algorithm is not allowed to show a pop-up:
         //   An algorithm is allowed to show a pop-up if, in the task in which the algorithm is running, either:
         //   - an activation behavior is currently being processed whose click event was trusted, or
         //   - the event listener for a trusted click event is being handled.
         if (!UserGestureIndicator::processingUserGesture())
             break;
 
         // There is a previously-established user preference, security risk, or platform limitation.
+        if (!document()->settings()->fullScreenEnabled())
+            break;
+        if (document()->settings()->disallowFullscreenForNonMediaElements() && !isHTMLMediaElement(element))
+            break;
 
         // 2. Let doc be element's node document. (i.e. "this")
         Document* currentDoc = document();
 
         // 3. Let docs be all doc's ancestor browsing context's documents (if any) and doc.
         Deque<Document*> docs;
 
         do {
             docs.prepend(currentDoc);
             currentDoc = currentDoc->ownerElement() ? &currentDoc->ownerElement()->document() : 0;
@@ skipping 347 matching lines @@
 
 void FullscreenElementStack::trace(Visitor* visitor)
 {
     visitor->trace(m_fullScreenElement);
     visitor->trace(m_fullScreenElementStack);
     visitor->trace(m_eventQueue);
     DocumentSupplement::trace(visitor);
 }
 
 } // namespace blink