Bug 214492 [Markers] Need to be able to add filters to existing markers views
Currently you can only add filters to a new markerContentProvider. We need to able to bind them to existing markerContentProviders as well.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerContentGenerator.java
includeAllSubtypes.add(type);
			}
		}
		monitor.beginTask(MarkerMessages.MarkerFilter_searching, typesToSearch
				.size()
				* resources.length);
		
		
		HashSet resourcesToSearch = new HashSet();
		
		for (int idx = 0; idx < resources.length; idx++) {
			IResource next = resources[idx];
			if (!next.exists())
				continue;
			if (resourcesToSearch.contains(next))
				monitor.worked(typesToSearch.size());
			else
				resourcesToSearch.add(next);
		}
		
		for (int resourceIdx = 0; resourceIdx < resources.length; resourceIdx++) {
			iter = typesToSearch.iterator();
			IResource resource = resources[resourceIdx];
			
			if (!resource.isAccessible()) {
				continue;
			}
			if (depth == IResource.DEPTH_INFINITE) {