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+The iossim binary here is a build of a tool found in the Chromium project:
+
+ http://src.chromium.org/viewvc/chrome/trunk/src/testing/iossim/iossim.mm?view=markup
+
+It is used to run the unittests for iOS. The old way that directly ran the
+executables with some environment variables set no longer works, so this
+provides a way that more closely imitates how Xcode itself invokes the
+Simulator.