Bug 36485 call hierarchy: location of menu entry
'Open Call Hierarchy' menu entry should be located right below 'Open Type Hierarchy'
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewPart.java
ISelectionChangedListener {
    private CallHierarchyViewSiteAdapter fViewSiteAdapter;
    private CallHierarchyViewAdapter fViewAdapter;
    public static final String CALLERS_VIEW_ID = "org.eclipse.jdt.callhierarchy.view";