Add MemoryPurgeController

Source/core/page/Page.h

Index: Source/core/page/Page.h
diff --git a/Source/core/page/Page.h b/Source/core/page/Page.h
index db79ad41952be94af326a559751c0bc50d7ff22c..6954469f71b0ad506acb6b015de5a75ad43ff791 100644
--- a/Source/core/page/Page.h
+++ b/Source/core/page/Page.h
@@ -32,6 +32,7 @@
 #include "core/page/PageLifecycleNotifier.h"
 #include "core/page/PageLifecycleObserver.h"
 #include "core/page/PageVisibilityState.h"
+#include "platform/MemoryPurgeController.h"
 #include "platform/Supplementable.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/geometry/Region.h"
@@ -200,6 +201,8 @@ public:
 
     static void networkStateChanged(bool online);
 
+    MemoryPurgeController& memoryPurgeController() { return m_memoryPurgeController; }
+
     DECLARE_TRACE();
     void willBeDestroyed();
 
@@ -269,6 +272,8 @@ private:
     // A pointer to all the interfaces provided to in-process Frames for this Page.
     // FIXME: Most of the members of Page should move onto FrameHost.
     OwnPtrWillBeMember<FrameHost> m_frameHost;
+
+    MemoryPurgeController m_memoryPurgeController;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT WillBeHeapSupplement<Page>;