[Reland] Update DomDistillerJsUpdater and Roll DomDistillerJs

[Reland] Update DomDistillerJsUpdater and Roll DomDistillerJs

New in this version:
- Runs checklicenses.py against the code when running
update_dom_distiller_js.sh
- Picked up a couple new changes (including fix for checklicenses.py
failure)

Original Description:

The update script should build `ant package` and copy the entire
out/package directory.

This moves the path to domdistiller.js to .../package/js so update
that reference.

The old (non-proto) API is still supported, so this keeps using that.

Picked up changes:
a15dc85 Change json protoc generation directory
f9c9a21 Add GENERATED FILE header to proto-plugin files
e99285f add *.pyc to .gitignore
fdb023d Fix Proto module's path
44e9366 This adds two simple protoc plugins.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269972

[cjhopman, 2014-05-12 18:04:24]

yfriedman: *

https://codereview.chromium.org/282663002/diff/1/third_party/dom_distiller_js...
File third_party/dom_distiller_js/update_domdistiller_js.sh (right):

https://codereview.chromium.org/282663002/diff/1/third_party/dom_distiller_js...
third_party/dom_distiller_js/update_domdistiller_js.sh:40: # Run
checklicenses.py on the pulled files, but only print the output on
Ugh, should have uploaded an unchanged from original version. These two lines
are the only new thing here.

[Yaron, 2014-05-12 18:12:53]

lgtm

[cjhopman, 2014-05-13 01:00:58]

The CQ bit was checked by cjhopman@chromium.org

[commit-bot: I haz the power, 2014-05-13 01:01:38]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/cjhopman@chromium.org/282663002/20001

[commit-bot: I haz the power, 2014-05-13 02:27:56]

Change committed as 269972