Make DependencyGraph.DeepDependencies() depth-first.

test/dependencies/gyptest-all-dependent-settings-order.py

Index: test/dependencies/gyptest-all-dependent-settings-order.py
diff --git a/test/dependencies/gyptest-all-dependent-settings-order.py b/test/dependencies/gyptest-all-dependent-settings-order.py
new file mode 100644
index 0000000000000000000000000000000000000000..715f322f41960e62eae41acdb6cbb6032613b13b
--- /dev/null
+++ b/test/dependencies/gyptest-all-dependent-settings-order.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+
+# Copyright 2015 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Tests that all_dependent_settings are processed in topological order.
+"""
+
+import TestGyp
+
+test = TestGyp.TestGyp()
+
+test.run_gyp('all_dependent_settings_order.gyp', chdir='adso')
+test.build('all_dependent_settings_order.gyp', chdir='adso')
+test.built_file_must_match('out.txt', 'd.cc a.cc b.cc c.cc',
+                           chdir='adso')
+test.pass_test()