Re: [w3c/webcomponents] [WebDriver] Testability of web components (#771)

@diervo

> All we have done to enable this, is to provide a couple of helper methods to our WebDriver classes that facilitate navigation and traversal

What I'd like to know is why you needed those methods. Here's an example of a concrete use case.

 - I want to write an integration test, and make sure when I click on a "Done" button inside a calendar widget's shadow tree, it would reflect the change back to the timeline widget's shadow tree.
 - I want to write an unit test for a chart component, and I want to verify that when I update the data set associated with it via a method on the chart, the canvas element inside its shadow tree gets redrawn.

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