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

scripts/slave/recipes/chromium_gn.expected/full_chromium_linux_Linux_GN__dbg_.json

Index: scripts/slave/recipes/chromium_gn.expected/full_chromium_linux_Linux_GN__dbg_.json
diff --git a/scripts/slave/recipes/chromium_gn.expected/full_chromium_linux_Linux_GN__dbg_.json b/scripts/slave/recipes/chromium_gn.expected/full_chromium_linux_Linux_GN__dbg_.json
new file mode 100644
index 0000000000000000000000000000000000000000..1df82fbd5549c743b6836b850dbc09521966b242
--- /dev/null
+++ b/scripts/slave/recipes/chromium_gn.expected/full_chromium_linux_Linux_GN__dbg_.json
@@ -0,0 +1,102 @@
+[
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "[DEPOT_TOOLS]/gclient.py",
+      "config",
+      "--spec",
+      "cache_dir = None\nsolutions = [{'custom_vars': {'googlecode_url': 'svn://svn-mirror.golo.chromium.org/%s', 'nacl_trunk': 'svn://svn-mirror.golo.chromium.org/native_client/trunk', 'sourceforge_url': 'svn://svn-mirror.golo.chromium.org/%(repo)s', 'webkit_trunk': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]"
+    ],
+    "name": "gclient setup"
+  },
+  {
+    "abort_on_failure": true,
+    "cmd": [
+      "python",
+      "-u",
+      "[BUILD]/scripts/slave/gclient_safe_revert.py",
+      ".",
+      "[DEPOT_TOOLS]/gclient"
+    ],
+    "name": "gclient revert"
+  },
+  {
+    "abort_on_failure": true,
+    "cmd": [
+      "python",
+      "-u",
+      "[DEPOT_TOOLS]/gclient.py",
+      "sync",
+      "--nohooks",
+      "--delete_unversioned_trees",
+      "--force",
+      "--output-json",
+      "/path/to/tmp/json"
+    ],
+    "name": "gclient sync",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"solutions\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": 170242@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/native_client/\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": 274981@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/third_party/WebKit/\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": 124383@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/third_party/webrtc/\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": 120644@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/tools/swarm_client/\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": 200767@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/tools/swarming_client/\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": 276089@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@got_nacl_revision@274981@@@",
+      "@@@SET_BUILD_PROPERTY@got_webkit_revision@124383@@@",
+      "@@@SET_BUILD_PROPERTY@got_swarming_client_revision@276089@@@",
+      "@@@SET_BUILD_PROPERTY@got_webrtc_revision@120644@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@170242@@@",
+      "@@@SET_BUILD_PROPERTY@got_swarm_client_revision@200767@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "[DEPOT_TOOLS]/gclient.py",
+      "runhooks"
+    ],
+    "env": {
+      "GYP_CHROMIUM_NO_ACTION": "1"
+    },
+    "name": "gclient runhooks"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "[DEPOT_TOOLS]/gn.py",
+      "gen",
+      "-o",

[brettw, 2014/03/27 04:54:04]

Delete this.

+      "out/Debug",

[iannucci, 2014/03/27 01:33:57]

noooooooo! :)

(as we discussed) relative paths on bots are a really bad thing (they lead to a
lot of hard to debug cruft). We should make gn happy with an absolute path.

Maybe if gn was run in [CHECKOUT]/src it could do the relative path calculation
if it needs to do so internally?

[brettw, 2014/03/27 04:54:04]

You can just change this to //out/Debug and there should be no ambiguity.

+      "--args=is_debug=true"
+    ],
+    "name": "gn"
+  },
+  {
+    "cmd": [
+      "[DEPOT_TOOLS]/ninja",
+      "-C",
+      "[SLAVE_BUILD]/src/out/Debug"
+    ],
+    "name": "compile"
+  }
+]