Bug 88635 [EditorMgmt] add performance tracking for content type resolution
This operation could be expensive and should be tracked.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/IDE.java
* 
     * @param page
     *            the workbench page to open the editor in
     * @param marker
     *            the marker to open
     * @return an open editor or <code>null</code> not possible
     * @exception PartInitException
     *                if the editor could not be initialized
     * @see #openEditor(org.eclipse.ui.IWorkbenchPage,
     *      org.eclipse.core.resources.IMarker, boolean)
     */
    public static IEditorPart openEditor(IWorkbenchPage page, IMarker marker)
            throws PartInitException {
        return openEditor(page, marker, true);
    }
    /**
     * Opens an editor on the file resource of the given marker. 
     * <p>
     * If this page already has an editor open on the marker resource file that 
     * editor is brought to front; otherwise, a new editor is opened. If 
     * <code>activate == true</code> the editor will be activated.  The cursor and 
     * selection state of the editor are then updated from information recorded in 
     * the marker.
     * </p><p>
     * If the marker contains an <code>EDITOR_ID_ATTR</code> attribute 
     * the attribute value will be used to determine the editor type to be opened. 
     * If not, the registered editor for the marker resource file will be used. 
     * </p>
     *
     * @param page the workbench page to open the editor in