Bug 181982 [Viewers] content provider in TreeTest should return children when getElements is called
tests/org.eclipse.ui.tests.performance/src/org/eclipse/jface/tests/performance/TreeTest.java
* 
	 * @see org.eclipse.jface.tests.performance.ViewerTest#getInitialInput()
	 */
	protected Object getInitialInput() {
		return new TestTreeElement(0, null);
	}
	/**
	 * Get a content provider for the tree viewer.
	 * 
	 * @return
	 */
	private IContentProvider getContentProvider() {
		return new ITreeContentProvider() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
			 */
			public Object[] getChildren(Object parentElement) {
				TestTreeElement element = (TestTreeElement) parentElement;
				return element.children;
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
			 */
			public Object getParent(Object element) {
				return ((TestTreeElement) element).parent;
			}