[polymer] import all elements

[polymer] import all elements

Imports polymer-elements and polymer-ui-elements into (for now) the polymer package. This will allow us to begin to reuse the JavaScript custom elements.

Notes:

In an ideal world we would have some way of importing these straight from Bower, probably via Pub. However we don't have support for that.

It would also be nice to have separate Pub packages, at least for polymer-elements and polymer-ui-elements (the lovely Dart ports @ http://pub.dartlang.org/packages/polymer_elements follow this pattern). However that too depends on some kind of Pub+Bower integration, as they use (at least) the convention of "components/" for dependencies instead of "packages/" or "assets/".

So for now, we'll import them into package:polymer.

R=sigmund@google.com

Committed: https://code.google.com/p/dart/source/detail?r=33183

[Jennifer Messerly, 2014-02-26 19:54:07]

Note: Rietveld is dying with this CL. However I'm not trying to make any code
changes here. This is just pulling down polymer-elements and polymer-ui-elements
from bower (via https://codereview.chromium.org/181673003/) and "git add
pkg/polymer/lib/elements". The code comes from https://github.com/Polymer.

I checked the file size, and the entire Polymer package weighs in at ~1.4 MB in
a tar.gz file after adding these, which is still quite reasonable IMHO (for
comparison the "dart" binary is ~4MB gzipped on Linux).

[Siggi Cherem (dart-lang), 2014-02-26 22:54:44]

lgtm

[Jennifer Messerly, 2014-03-01 03:06:34]

Committed patchset #5 manually as r33183 (presubmit successful).