dom-repeat isn't supplying expected variables

[admwx7]

Description

When using a filter on dom-repeat only one parameter is being passed to the filter function when it's called, the current item in the array, this is a bit of a hindrance when performing filtering on arrays since index and the original array are often used in the filtering process and are supplied when dealing with filtering, it is expected that dom-repeat would match the JS spec for array.filter that provides all three.

Live Demo

https://jsfiddle.net/amurdock/rumt2by9/

Steps to Reproduce

1. Create a dom-repeat instance on an array
2. Attempt to filter the dom-repeat based on either the index or the original array value, these are typical parameters as you would expect when dealing with filtering an array
   https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

Expected Results

The filter gets called with (element, item, array)

Actual Results

The filter function is getting called with only the element parameter

Browsers Affected

• [x ] Chrome
• [x ] Firefox
• [x ] Edge
• [x ] Safari 9
• [x ] Safari 8
• [x ] IE 11

Versions

• Polymer: v1.6.0
• webcomponents: v0.7.22

[admwx7]

Obsoleted due to #3094 #3798