Extract simpler classes for observing context lifecycle and observe Page lifecycle inNavigatorVibra…

Source/core/page/PageLifecycleObserver.h

Index: Source/core/page/PageLifecycleObserver.h
diff --git a/Source/core/rendering/RenderMediaControls.h b/Source/core/page/PageLifecycleObserver.h
similarity index 76%
copy from Source/core/rendering/RenderMediaControls.h
copy to Source/core/page/PageLifecycleObserver.h
index d1b3f87be7805b5d0a3344a0e2edd07afb389da3..76424f63b3d9c49177df067e5c10f8d874cc8506 100644
--- a/Source/core/rendering/RenderMediaControls.h
+++ b/Source/core/page/PageLifecycleObserver.h
@@ -1,5 +1,6 @@
+
 /*
- * Copyright (C) 2009 Apple Inc. All Rights Reserved.
+ * Copyright (C) 2013 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -20,29 +21,26 @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef RenderMediaControls_h
-#define RenderMediaControls_h
+#ifndef PageLifecycleObserver_h
+#define PageLifecycleObserver_h
 
-#include "core/html/shadow/MediaControlElements.h"
+#include "core/dom/SimpleLifecycleObserver.h"
 
 namespace WebCore {
 
-struct PaintInfo;
-
-class HTMLMediaElement;
-class IntRect;
-class IntSize;
-class RenderBox;
-class RenderObject;
-class RenderStyle;
+class Page;
 
-class RenderMediaControls {
+class PageLifecycleObserver : public SimpleLifecycleObserver {
 public:
+    explicit PageLifecycleObserver(Page*);
+    virtual ~PageLifecycleObserver();
+
+    virtual void pageVisibilityChanged() { }
 };
 
 } // namespace WebCore
 
-#endif // RenderMediaControls_h
+#endif // PageLifecycleObserver_h