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I added a function to test if a variable is visible or not to the debugger tests. BUG=dartbug.com/22353 TEST=standalone/debugger/local_variables_test R=hausner@google.com Review URL: https://codereview.chromium.org//933253003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43850 260f80e4-7a28-3924-810f-c04153c831b5