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Introduce DartLibraryGenerator and CPPLibraryGenerator classes that are responsible for creating per-interface files and importing them into single library file at the end. System and BaseGenerator implementations don't have to deal with file paths anymore. R=antonm@google.com,vsm@google.com Review URL: https://codereview.chromium.org//10987019 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12898 260f80e4-7a28-3924-810f-c04153c831b5