inconsistent event "content-scroll"

[alfalabs]

Description

<paper-header-panel> and <paper-scroll-header-panel> share event named content-scroll
In supplied example, this event fires while using <paper-scroll-header-panel> but not with <paper-header-panel>
The problem is not with event not firing in <paper-header-panel> (there is another way to get this event) but the need to write different code for each header-panel.

Also filed under: PolymerElements/paper-scroll-header-panel#97
Related issue: #84

Expected outcome

Events named with the same name should have consistent behavior. The web components inside these panels should have the same code to handle scrolling - to be reusable in both.

Actual outcome

Different code has to be written for each panel type.

Live Demo

example with paper-scroll-header-panel - event is firing - please see console.
https://jsbin.com/yigeciyomo/edit?html,console,output

example with paper-header-panel - event not firing - please see console for lack of message.
https://jsbin.com/miyuluxojo/edit?html,console,output

[blasten]

closing since this issue was answered in PolymerElements/paper-scroll-header-panel#97