Stop firing orientationchange events at pages that are not visible

Source/core/dom/FullscreenElementStack.cpp

Index: Source/core/dom/FullscreenElementStack.cpp
diff --git a/Source/core/dom/FullscreenElementStack.cpp b/Source/core/dom/FullscreenElementStack.cpp
index 22875bfdc6440676f30dc17a5338acdcf3372529..adc93809507982eeb27c610ccc7fca671d84c69c 100644
--- a/Source/core/dom/FullscreenElementStack.cpp
+++ b/Source/core/dom/FullscreenElementStack.cpp
@@ -30,6 +30,7 @@
 
 #include "HTMLNames.h"
 #include "core/dom/Document.h"
+#include "core/dom/FullscreenObserver.h"
 #include "core/events/Event.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
@@ -135,6 +136,16 @@ void FullscreenElementStack::documentWasDisposed()
     m_fullScreenElementStack.clear();
 }
 
+void FullscreenElementStack::addObserver(FullscreenObserver* observer)
+{
+    m_fullscreenObservers.add(observer);
+}
+
+void FullscreenElementStack::removeObserver(FullscreenObserver* observer)
+{
+    m_fullscreenObservers.remove(observer);
+}
+
 bool FullscreenElementStack::fullScreenIsAllowedForElement(Element* element) const
 {
     ASSERT(element);
@@ -348,6 +359,7 @@ void FullscreenElementStack::webkitExitFullscreen()
     // full screen stack.
     if (!newTop) {
         host->chrome().client().exitFullScreenForElement(m_fullScreenElement.get());
+        notifyObserversDidFullyExitFullScreen();
         return;
     }
 
@@ -516,6 +528,14 @@ void FullscreenElementStack::fullScreenChangeDelayTimerFired(Timer<FullscreenEle
     }
 }
 
+void FullscreenElementStack::notifyObserversDidFullyExitFullScreen()
+{
+    Vector<FullscreenObserver*> copy;
+    copyToVector(m_fullscreenObservers, copy);
+    for (Vector<FullscreenObserver*>::const_iterator it = copy.begin(); it != copy.end(); ++it)
+        (*it)->didFullyExitFullscreen();
+}
+
 void FullscreenElementStack::fullScreenElementRemoved()
 {
     m_fullScreenElement->setContainsFullScreenElementOnAncestorsCrossingFrameBoundaries(false);