Stop firing orientationchange events at pages that are not visible

Source/core/dom/FullscreenObserver.h

Index: Source/core/dom/FullscreenObserver.h
diff --git a/Source/core/inspector/InspectorNodeIds.h b/Source/core/dom/FullscreenObserver.h
similarity index 52%
copy from Source/core/inspector/InspectorNodeIds.h
copy to Source/core/dom/FullscreenObserver.h
index 50d3623270a2a2b7f1defeb34c74060baa2e236b..635c6ff0b67119c6b5403588cb185f9435d855f5 100644
--- a/Source/core/inspector/InspectorNodeIds.h
+++ b/Source/core/dom/FullscreenObserver.h
@@ -2,20 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef InspectorNodeIds_h
-#define InspectorNodeIds_h
+#ifndef FullscreenObserver_h
+#define FullscreenObserver_h
 
 namespace WebCore {
 
-class Node;
-
-class InspectorNodeIds {
+class FullscreenObserver {
 public:
-    static int idForNode(Node*);
-    static Node* nodeForId(int);
+    virtual void didFullyExitFullscreen() = 0;
+
+    virtual ~FullscreenObserver() { }
 };
 
 } // namespace WebCore
 
-
-#endif // !defined(InspectorNodeIds_h)
+#endif // FullscreenObserver_h