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
* Returns the current selection.
     */
    protected ISelection getSelection() {
        return getSite().getSelectionProvider().getSelection();
    }
    protected void fillContextMenu(IMenuManager menu) {
        JavaPlugin.createStandardGroups(menu);
        menu.appendToGroup(IContextMenuConstants.GROUP_SHOW, fRefreshAction);
    }
    protected void handleKeyEvent(KeyEvent event) {
        if (event.stateMask == 0) {
            
            
            
            
            
            
             
            if (event.keyCode == SWT.F5) {
                if ((fRefreshAction != null) && fRefreshAction.isEnabled()) {
                    fRefreshAction.run();
                    return;
                }
            }
        }
    }
    private IActionBars getActionBars() {
        return getViewSite().getActionBars();
    }
    private void setCalleeRoot(MethodWrapper calleeRoot) {