Bug 150601 Drillthrough link from pdf(frameset) should link to frameset servlet instead of run.
Description: Drillthrough link from pdf(frameset) should link to frameset servlet instead of run. Steps to reproduce: 1. New a report 2. Insert a label and define a drill through link to other report 3. Preview in Web viewer, click Print as PDF button in viewer toolbar 4. Click drill through link in pdf Expected result: Target report opens through frameset sevlet instead of run servlet. Because the pdf is displayed through frameset servlet. Actual result: Target report opened through run sevlet
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ViewerHTMLActionHandler.java
{
			case IAction.ACTION_BOOKMARK :
			{
				return buildBookmarkAction( actionDefn, context );
			}
			case IAction.ACTION_HYPERLINK :
			{
				return actionDefn.getActionString( );
			}
			case IAction.ACTION_DRILLTHROUGH :
			{
				return buildDrillAction( actionDefn, context );
			}
		}
		return null;
	}
	/**
	 * Build URL for bookmark.
	 * 
	 * @param action
	 * @param context
	 * @return the bookmark url
	 */
	protected String buildBookmarkAction( IAction action, Object context )
	{
		if ( action == null || context == null )
			return null;
		
		String baseURL = null;
		if ( context instanceof HTMLRenderContext )