Implement modular compilation

karma.conf.js

 // Karma configuration
 // Generated on Mon Apr 20 2015 06:33:20 GMT-0700 (PDT)
 
 module.exports = function(config) {
   var configuration = {
 
     // base path that will be used to resolve all patterns (eg. files, exclude)
     basePath: '',
 
     // frameworks to use
     // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
     frameworks: ['mocha', 'requirejs', 'chai'],
 
     // list of files / patterns to load in the browser
     files: [
       'lib/runtime/dart_*.js',
       'lib/runtime/dart/*.js',
       // {pattern: 'test/browser/*.js', included: false}
       'test/codegen/expect/async_helper/async_helper.js',
       'test/codegen/expect/dom/dom.js',
       'test/codegen/expect/expect/expect.js',
       'test/codegen/expect/matcher/matcher.js',
-      'test/codegen/expect/matcher/src/*.js',
       'test/codegen/expect/unittest/unittest.js',
       'test/codegen/expect/syncstar_syntax.js',
       'test/codegen/expect/language-all.js',
       'test/codegen/expect/language/sub/sub.js',
       'test/codegen/expect/language/*.lib',
       'test/codegen/expect/lib-typed_data-all.js',
       'test/browser/*.js',
       'test-main.js',
     ],
 
@@ skipping 59 matching lines @@
     configuration.browsers = ['chrome_canary_travis', 'Electron'];
     configuration.autoWatch = false;
     // Enable this for more logging on Travis.  It is too much for Travis to
     // automatically display, but still results in a downloadable raw log.
     // configuration.logLevel = config.LOG_DEBUG;
     configuration.client.captureConsole = true;
   }
 
   config.set(configuration);
 };