Bug 209119 Need WebViewer provide cancel function
Need WebViewer provide a cancel function, this will be used to cancel current report execution during designer preview.
viewer/org.eclipse.birt.report.viewer/src/org/eclipse/birt/report/viewer/utilities/WebViewer.java
LocaleTable = new TreeMap( );
		Locale[] locales = Locale.getAvailableLocales( );
		if ( locales != null )
		{
			for ( int i = 0; i < locales.length; i++ )
			{
				Locale locale = locales[i];
				if ( locale != null )
				{
					LocaleTable.put( locale.getDisplayName( ), locale
							.getLanguage( )
							+ "_" + locale.getCountry( ) ); 
				}
			}
		}
	}
	/**
	 * Get web viewer base url.
	 * 
	 * @return base web viewer application url
	 */
	private static String getBaseURL( )
	{
		return "http://" + WebappAccessor.getHost( ) + ":" 
				+ WebappAccessor.getPort( ) + "/viewer/"; 
	}
	/**
	 * Create web viewer url to run the report.
	 *