Presubmit: Always run recipe test and gen_tasks test on commit

infra/bots/recipes/swarm_presubmit.py

Index: infra/bots/recipes/swarm_presubmit.py
diff --git a/infra/bots/recipes/swarm_presubmit.py b/infra/bots/recipes/swarm_presubmit.py
index 84d82231e83e5bd2c7ee498e17b0ea489a0e55ab..fbbbd44c3e3991b13783d9cddda0f0e9cf821bd2 100644
--- a/infra/bots/recipes/swarm_presubmit.py
+++ b/infra/bots/recipes/swarm_presubmit.py
@@ -7,6 +7,7 @@
 
 
 DEPS = [
+  'build/file',
   'core',
   'depot_tools/depot_tools',
   'recipe_engine/path',
@@ -21,13 +22,21 @@ def RunSteps(api):
   api.vars.setup()
   api.core.checkout_steps()
 
+  # Create a local GOPATH.
+  gopath = api.vars.slave_dir.join('gopath')
+  if not api.path.exists(gopath):
+    api.file.makedirs('gopath', gopath)
+
   api.step('git status',
            cmd=['git', 'status'],
            cwd=api.vars.skia_dir)
 
   depot_tools_path = api.depot_tools.package_repo_resource()
   script = depot_tools_path.join('presubmit_support.py')
-  env = {'PATH': api.path.pathsep.join([str(depot_tools_path), '%(PATH)s'])}
+  env = {
+      'PATH': api.path.pathsep.join([str(depot_tools_path), '%(PATH)s']),
+      'GOPATH': str(gopath),
+  }
   # TODO(borenet): --upstream=HEAD^ is a hack to force presubmit_support to
   # find a diff. Otherwise, it quits early with:
   #  "Warning, no PRESUBMIT.py found."