Added swarming step to the Blink trybots

scripts/slave/recipe_modules/chromium_tests/api.py

Index: scripts/slave/recipe_modules/chromium_tests/api.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/api.py b/scripts/slave/recipe_modules/chromium_tests/api.py
index c13a16628623d5e47468a90d4d6c19576550c9a5..27f47d571d03978e8c94ded234edffb1d3762750 100644
--- a/scripts/slave/recipe_modules/chromium_tests/api.py
+++ b/scripts/slave/recipe_modules/chromium_tests/api.py
@@ -467,6 +467,30 @@ class ChromiumTestsApi(recipe_api.RecipeApi):
 
     return True, self.m.filter.matching_exes, compile_targets
 
+  def configure_swarming(self, project_name):

[M-A Ruel, 2014/10/29 13:04:50]

Add precommit as a parameter.

It'd be a bool value.

[Sergiy Byelozyorov, 2014/10/29 13:20:42]

Done.

+    """Configures default swarming dimensions and tags.
+
+    Args:
+      project_name: Lowercase name of the project, e.g. "blink", "chromium".
+      build_properties: Build properties object (api.properties in the recipe).
+    """
+    self.m.swarming.set_default_dimension('pool', 'Chrome')
+    self.m.swarming.add_default_tag('project:%s' % project_name)
+    self.m.swarming.add_default_tag('purpose:pre-commit')

[M-A Ruel, 2014/10/29 13:04:50]

self.m.swarming.add_default_tag('purpose:pre-commit' if precommit else
'purpose:post-commit')

[Sergiy Byelozyorov, 2014/10/29 13:20:42]

Done.

+    self.m.swarming.default_idempotent = True
+
+    requester = self.m.properties.get('requester')

[M-A Ruel, 2014/10/29 13:04:50]

if precommit:
  <lines 482-492>
else:
  self.m.swarming.default_priority = 25

[Sergiy Byelozyorov, 2014/10/29 13:20:42]

Done. Also added

self.m.swarming.add_default_tag('purpose:CI')

to have identical behavior with chromium.py

+    if requester == 'commit-bot@chromium.org':
+      self.m.swarming.default_priority = 30
+      self.m.swarming.add_default_tag('purpose:CQ')
+      blamelist = self.m.properties.get('blamelist')
+      if len(blamelist) == 1:
+        requester = blamelist[0]
+    else:
+      self.m.swarming.default_priority = 50
+      self.m.swarming.add_default_tag('purpose:ManualTS')
+    self.m.swarming.default_user = requester
+
   # Used to build the Google Storage archive url.
   #
   # We need to special-case the logic for composing the archive url for a couple