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

scripts/slave/recipes/chromium_gn.py

Index: scripts/slave/recipes/chromium_gn.py
diff --git a/scripts/slave/recipes/chromium_gn.py b/scripts/slave/recipes/chromium_gn.py
new file mode 100644
index 0000000000000000000000000000000000000000..6f2505af832ebf02a71fd182ac1a67098135ae20
--- /dev/null
+++ b/scripts/slave/recipes/chromium_gn.py
@@ -0,0 +1,51 @@
+# 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)
+
+  # TODO(dpranke): The build_config should probably be a property passed
+  # in from slaves.cfg, but that doesn't exist today, so we need a lookup
+  # mechanism to map bot name to build_config.
+  build_config = {
+    'Linux GN (dbg)': 'Debug',
+  }[api.properties.get('buildername')]
+
+  api.chromium.set_config('chromium', BUILD_CONFIG=build_config)
+  yield api.chromium.runhooks(run_gyp=False)
+
+  yield api.chromium.run_gn('//out/' + build_config)

[iannucci, 2014/03/28 22:40:42]

I think that if this must be not-really-a-path, the chromium module should
/still/ own it (probably in the chromium config).

[Dirk Pranke, 2014/03/28 23:52:06]

I think once we can get rid of the need to specify the custom build dir, this
should just disappear into the run_gn() method.

+
+  yield api.chromium.compile_with_ninja('compile', api.chromium.output_dir)
+
+  # TODO(dpranke): crbug.com/353854. Run gn_unittests and other tests
+  # when they are also being run as part of the try jobs.
+
+
+def GenTests(api):
+  yield (
+      api.test('unittest_basic') +
+      api.properties.generic(buildername='Linux GN (dbg)') +
+      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(buildername='Linux GN (dbg)') +
+      api.platform.name('linux')
+  )