Bug 36487 call hierarchy: drop should set input
dropping a method to the call hierarchy view should have the same effect as 'focus on'
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"; 
    private static final String DIALOGSTORE_VIEWORIENTATION = "CallHierarchyViewPart.orientation"; 
    private static final String DIALOGSTORE_CALL_MODE = "CallHierarchyViewPart.call_mode"; 
    private static final String DIALOGSTORE_JAVA_LABEL_FORMAT = "CallHierarchyViewPart.java_label_format"; 
    private static final String TAG_ORIENTATION = "orientation"; 
    private static final String TAG_CALL_MODE = "call_mode"; 
    private static final String TAG_JAVA_LABEL_FORMAT = "java_label_format"; 
    private static final String TAG_RATIO = "ratio"; 
    static final int VIEW_ORIENTATION_VERTICAL = 0;
    static final int VIEW_ORIENTATION_HORIZONTAL = 1;
    static final int VIEW_ORIENTATION_SINGLE = 2;
    static final int CALL_MODE_CALLERS = 0;
    static final int CALL_MODE_CALLEES = 1;
    static final int JAVA_LABEL_FORMAT_DEFAULT = JavaElementLabelProvider.SHOW_DEFAULT;
    static final int JAVA_LABEL_FORMAT_SHORT = JavaElementLabelProvider.SHOW_BASICS;
    static final int JAVA_LABEL_FORMAT_LONG = JavaElementLabelProvider.SHOW_OVERLAY_ICONS |
        JavaElementLabelProvider.SHOW_PARAMETERS |
        JavaElementLabelProvider.SHOW_RETURN_TYPE |
        JavaElementLabelProvider.SHOW_POST_QUALIFIED;
    static final String GROUP_SEARCH_SCOPE = "MENU_SEARCH_SCOPE"; 
    static final String ID_CALL_HIERARCHY = "org.eclipse.jdt.ui.CallHierarchy"; 
    private static final String GROUP_FOCUS = "group.focus"; 
    private static final int PAGE_EMPTY = 0;
    private static final int PAGE_VIEWER = 1;
    private Label fNoHierarchyShownLabel;
    private PageBook fPagebook;
    private IDialogSettings fDialogSettings;