Bug 199834 Enable access to IContent object in IReportItemPresentation layer
In IReportItemPresentation layer, the extended item may want to access properties from current IContent object, for example, bookmark, content style. So we need expose the content object in this layer.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/extension/internal/RowSet.java
{
		this.context = context;
		this.rset = rset;
		metaData = new IRowMetaData( ) {
			public int getColumnCount( )
			{
				return 0;
			}
			public String getColumnName( int index ) throws BirtException
			{
				return null;
			}
			public int getColumnType( int index ) throws BirtException
			{
				return -1;
			}
		};
		if ( rset != null )
		{
			try
			{
				metaData = new RowMetaData( rset.getResultMetaData( ) );
			}
			catch ( BirtException ex )
			{
				context.addException( ex );
			}
		}
	}
	public DataSetID getID( )