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Somewhat glitchy filtering has been added.
* Type in a package name (exact match) and click "Add" to add to filter.
* Click on any filter in the list to remove it.
Known issues:
* Locked nodes no longer appear locked when a filter is added/removed.
* Zoom/pan is reset when a new filter is added/removed.

These issues are mostly because of the way we interact with the d3
graph. A big upcoming TODO is to rework `renderGraph` into an API of
sorts which will give us finer control over what parts of the graph to
rerender, if nodes should keep their metadata (position, lock) upon
rerendering, etc.

This commit also pulls in and uses Vue.js via a CDN for the current
prototyping work. We will likely install via npm in the future.

Bug: 1093962
Change-Id: Ide0b6a649424deac56e2f4d8121b0029d9286e7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252378
Commit-Queue: James Long <yjlong@google.com>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780428}