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Generate the JS modules for the following elements:
* <xf-button>
* <xf-circular-progress>
* <xf-display-panel>
* <xf-panel-item>

And their test: files_xf_elements.unittest.m.js.

Bug: 1133186
Change-Id: I22c71f6a6e648c4a1b027ef1766eb4df060f9f93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576299
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834640}