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/views/markers/internal/MarkerSupportRegistry.java
return;
		}
		IExtension[] extensions = point.getExtensions();
		
		Map groupingEntries = new HashMap();
		Map entryIDsToEntries = new HashMap();
		Set attributeMappings = new HashSet();
		for (int i = 0; i < extensions.length; i++) {
			IExtension extension = extensions[i];
			processExtension(tracker, extension, groupingEntries,
					entryIDsToEntries, attributeMappings);
		}
		postProcessExtensions(groupingEntries, entryIDsToEntries,
				attributeMappings);
		tracker.registerHandler(this, ExtensionTracker
				.createExtensionPointFilter(point));
	}
	/**
	 * Process the extension and register the result with the tracker. Fill the
	 * map of groupingEntries and attribueMappings processed for post
	 * processing.
	 * 
	 * @param tracker
	 * @param extension
	 * @param groupIDsToEntries
	 *            Mapping of group names to the markerGroupingEntries registered
	 *            for them
	 * @param entryIDsToEntries
	 *            Mapping of entry ids to entries
	 * @param attributeMappings