GitLab

- Changed the IDL parser to mine the Comment nodes, and process them for
parameter comments.
- Added hacks to the doc builder to parse the IDL files and spit out a
generated JSON file before running the generator.

BUG=no
TEST=no

Review URL: https://chromiumcodereview.appspot.com/10082038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@132474 0039d316-1c4b-4281-b951-d872f2087c98