Bug 187796 [KeyBindings] IBindingService cannot return best active bindings for a ParameterizedCommand
IBindingService only supports getBestActiveBindingFor(final String commandId) ... there must be an equivalent method for ParameterizedCommands PW
bundles/org.eclipse.jface/src/org/eclipse/jface/bindings/BindingManager.java
public final void addBinding(final Binding binding) {
		if (binding == null) {
			throw new NullPointerException("Cannot add a null binding"); 
		}
		if (bindings == null) {
			bindings = new Binding[1];
		} else if (bindingCount >= bindings.length) {
			final Binding[] oldBindings = bindings;
			bindings = new Binding[oldBindings.length * 2];
			System.arraycopy(oldBindings, 0, bindings, 0, oldBindings.length);
		}
		bindings[bindingCount++] = binding;
		clearCache();
	}
	/**
	 * <p>
	 * Adds a listener to this binding manager. The listener will be notified
	 * when the set of defined schemes or bindings changes. This can be used to
	 * track the global appearance and disappearance of bindings.
	 * </p>
	 * <p>
	 * This method completes in amortized constant time (<code>O(1)</code>).
	 * </p>
	 * 
	 * @param listener
	 *            The listener to attach; must not be <code>null</code>.
	 */
	public final void addBindingManagerListener(
			final IBindingManagerListener listener) {
		addListenerObject(listener);