Bug 305389 EclipsePartService: Add getInputParts(String inputUri): Collection
Add support for the new InputPart-Type with Input-URI
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
MPart partBackA = partStackA.getChildren().get(1);
		MWindow windowB = application.getChildren().get(1);
		MPartStack partStackB = (MPartStack) windowB.getChildren().get(0);
		MPart partFrontB = partStackB.getChildren().get(0);
		MPart partBackB = partStackB.getChildren().get(1);
		getEngine().createGui(windowA);
		getEngine().createGui(windowB);
		EPartService partServiceA = (EPartService) partFrontA.getContext().get(
				EPartService.class.getName());
		EPartService partServiceB = (EPartService) partFrontB.getContext().get(
				EPartService.class.getName());
		partServiceA.activate(partBackA);
		assertEquals(windowA, application.getSelectedElement());
		MPart shouldBeCorrect = (MPart) partFrontA.getContext().get(
				IServiceConstants.ACTIVE_PART);
		assertNotNull(shouldBeCorrect);
		assertEquals(partBackA, partServiceA.getActivePart());
		partServiceB.activate(partBackB);
		assertEquals(windowB, application.getSelectedElement());
		shouldBeCorrect = (MPart) partFrontB.getContext().get(
				IServiceConstants.ACTIVE_PART);
		assertNotNull(shouldBeCorrect);
		assertEquals(partBackB, partServiceB.getActivePart());
	}
	public void testActivate_Unrendered() {
		MApplication application = createApplication("partFront", "partBack");
		MWindow window = application.getChildren().get(0);
		MPartStack partStack = (MPartStack) window.getChildren().get(0);
		MPart partFront = partStack.getChildren().get(0);
		MPart partBack = partStack.getChildren().get(1);