We're not consistent about that:
https://github.com/Polymer/core-header-panel/blob/master/core-header-panel.html
.

Seems safe to be explicit since this code depends on polymer.html.

In google-apis.html:

> @@ -6,6 +6,8 @@
>  Code distributed by Google as part of the polymer project is also
>  subject to an additional IP rights grant found at http://polymer.github.io/PATENTS
>  -->
> +
> +<link rel="import" href="../polymer/polymer.html">

this is redundant because of the following line, only elements that have no
element dependencies need to import polymer.html

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