21c9976f78
This CL makes it possible to run Sky apps offline by introducing new DartLibraryProvider subclasses, specifically one that can load directly from the file system. A future CL will expand this functionality to work with asset bundles as well. Currently, the only platform that uses this functionality is Linux, which can now load a simple Sky app without even loading a network stack. Making this work on other platforms is work for future CLs. TBR=eseidel@chromium.org Review URL: https://codereview.chromium.org/1203143004.