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Make gn.py support root directories other than 'src'.
In https://codereview.chromium.org/341533006/ a change was made so that gn.py is not looking for the .gn file to identify the root of the checkout. This breaks GN functionality for projects that uses gclient but have a top directory named something else than 'src'. This change adds support for arbitrarily named primary (the first) solutions in the .gclient file. It also adds a check for the generated GN path so a friendly error message can be printed if the GN executable cannot be found. BUG=389883 TESTED=Various cases of Chromium, WebRTC and custom checkouts with .gclient containing empty solution list, solution missing the 'name' key and so on. Review URL: https://codereview.chromium.org/538393002 git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@291819 0039d316-1c4b-4281-b951-d872f2087c98
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