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

Source/core/page/PageLifecycleNotifier.cpp

+/*
+ * 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
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * 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.
+ */
+
+
+#include "config.h"
+#include "core/page/PageLifecycleNotifier.h"
+
+namespace WebCore {
+
+PageLifecycleNotifier::PageLifecycleNotifier(LifecycleContext* context)
+    : LifecycleNotifier(context)
+{
+}
+
+void PageLifecycleNotifier::addObserver(LifecycleObserver* observer, LifecycleObserver::Type type)
+{
+    if (type == LifecycleObserver::PageLifecycleObserverType) {
+        RELEASE_ASSERT(m_iterating != IteratingOverPageObservers);
+        m_pageObservers.add(static_cast<PageLifecycleObserver*>(observer));
+    }
+
+    LifecycleNotifier::addObserver(observer, type);
+}
+
+void PageLifecycleNotifier::removeObserver(LifecycleObserver* observer, LifecycleObserver::Type type)
+{
+    if (type == LifecycleObserver::PageLifecycleObserverType) {
+        RELEASE_ASSERT(m_iterating != IteratingOverPageObservers);
+        m_pageObservers.remove(static_cast<PageLifecycleObserver*>(observer));
+    }
+
+    LifecycleNotifier::removeObserver(observer, type);
+}
+
+} // namespace WebCore