Add GN (the build tool) to the chromium.linux buildbots and try jobs

scripts/slave/recipes/gn_buildbot.py

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+DEPS = [
+  'chromium',
+  'gclient',
+  'platform',
+  'properties',
+]
+
+
+def GenSteps(api):
+  api.gclient.set_config('chromium')
+  yield api.gclient.checkout(revert=True)
+
+  api.chromium.set_config('chromium')
+  yield api.chromium.runhooks(run_gyp=False)
+
+  yield api.chromium.run_gn(api.chromium.output_dir)
+
+  yield api.chromium.compile_with_ninja('compile', api.chromium.output_dir)
+
+  # TODO(dpranke): crbug.com/353854. We should pull the list of test_targets
+  # from src/testing/buildbot.
+  yield api.chromium.runtest('gn_unittests', annotate='gtest')
+
+
+def GenTests(api):
+  yield (
+      api.test('unittest_basic') +
+      api.properties.generic(build_config='Debug') +
+      api.platform.name('linux')
+  )
+
+  # TODO(dpranke): This test should actually produce the same result
+  # as the previous test, but it specifically matches what is run
+  # on the "Linux GN (dbg)" bot. We should have one 'simulation' test
+  # for each bot config. Ideally this should live somewhere else
+  # closer to the master tests.
+  yield (
+      api.test('full_chromium_linux_Linux_GN__dbg_') +
+      api.properties.generic(build_config='Debug') +
+      api.platform.name('linux')
+  )