Create targets for dart2js files, pub files, pkg files.

We are seeing issues on mac 10.7 where the list of inputPaths in xcode files becomes to long (this is also dependent depth of your build directory).
The build silently fails without giving any error.

BUG:18333

Also see:
http://build.chromium.org/p/client.dart/builders/dart2js-safari-mac10.7-1-3-be/builds/4640/steps/Build%20SDK/logs/stdio

R=ahe@google.com

Review URL: https://codereview.chromium.org//247073003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@35255 260f80e4-7a28-3924-810f-c04153c831b5
3 files changed