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/ReportItemGenerationBase.java
{
	protected ExtendedItemHandle modelHandle;
	protected ClassLoader appClassLoader;
	protected IReportContext context;
	protected IBaseQueryDefinition[] queries;
	/**
	 * Constructor that does nothing
	 */
	public ReportItemGenerationBase( )
	{
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IReportItemGeneration#getSize()
	 */
	public Size getSize( )