Add a new --extra-lib option to apidoc that allows us to specify an explicit .dart file that should be included in the processing. Change the gyp file to use --extra-lib for mock.dart. Remove the import of mock.dart from unittest.dart.
Add a new --extra-lib option to apidoc that allows us to specify an explicit .dart file that should be included in the processing.
Change the gyp file to use --extra-lib for mock.dart.
Remove the import of mock.dart from unittest.dart.

R=amouravski@google.com

Review URL: https://codereview.chromium.org//14736010

git-svn-id: b889c0189f1adfea19efba192a3d7a5b889e4120@22560 260f80e4-7a28-3924-810f-c04153c831b5

kevmoo/test,kevmoo/test,iglherme/Guttiest,iglherme/Guttiest,greglittlefield-wf/test,d2m/test,grouma/test,Pacane/test,grouma/test,apwilson/test,iglherme/Guttiest,greglittlefield-wf/test,apwilson/test,d2m/test,d2m/test,kevmoo/test,Pacane/test,apwilson/test,greglittlefield-wf/test,grouma/test