Bug 146352 support cancel execution for "view report ..." tool bar and menu actions.
Current "view report as HTML" and "view report as PDF" in the menu tool bar uses RunAndRender task to stream back the report output. As a result, total page count is not available when the report is being streamed back. Please change these two requests to use Run task and then render task to generate HTML or PDF, so that the total page count is calculate. preview tab could continue to use RunAndRender task, since it is for preview.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
*            the system ID to search the resource in the document,
	 *            generally it is the file name of the report design
	 * @param options
	 *            the config options used in document
	 * @return the report docuement
	 */
	public IReportDocument openReportDocument( String systemId, String docName,
			Map options )
	{
		IReportDocument document = null;
		try
		{
			document = engine.openReportDocument( systemId, docName, options );
		}
		catch ( Exception e )
		{
		}
		return document;
	}
	/**
	 * Render image.
	 * 
	 * @param imageId
	 * @param outputStream
	 * @throws RemoteException
	 */
	public void renderImage( String imageId, OutputStream outputStream )
			throws RemoteException
	{
		assert ( this.imageHandler != null );