Bug 1409739 - Part 4: Add a DMD variant of AWSY tests. r=bc

This makes enabling DMD at runtime in automation opt-in via a '--dmd' param.
Currently this is enabled via the 'awsy-dmd-e10s' and 'awsy-base-dmd-e10s'
tests.

--HG--
extra : rebase_source : 0371dca4d99197e7f0a37dfcd3763903f807b7b0

taskcluster/ci/test/awsy.yml

@@ -26,6 +26,14 @@ awsy:
             .*-devedition/.*: []  # don't run on devedition
             default: built-projects
 
+awsy-dmd:
+    description: "Are we slim yet - dmd enabled"
+    treeherder-symbol: SY(sy-d)
+    run-on-projects: ['try']
+    mozharness:
+        extra-options:
+            - --dmd
+
 awsy-base:
     description: "Are we slim yet - about:blank base case"
     treeherder-symbol: SY(ab)
@@ -37,6 +45,15 @@ awsy-base:
         extra-options:
             - --base
 
+awsy-base-dmd:
+    description: "Are we slim yet - about:blank base case - dmd enabled"
+    treeherder-symbol: SY(ab-d)
+    run-on-projects: ['try']
+    mozharness:
+        extra-options:
+            - --base
+            - --dmd
+
 awsy-stylo-sequential:
     description: "Are we slim yet for Stylo sequential"
     treeherder-symbol: SYss(sy)

taskcluster/ci/test/test-sets.yml

@@ -119,6 +119,8 @@ raptor-fetch-chrome:
 awsy:
     - awsy
     - awsy-base
+    - awsy-dmd
+    - awsy-base-dmd
 
 awsy-stylo-sequential:
     - awsy-stylo-sequential

testing/mozharness/scripts/awsy_script.py

@@ -56,6 +56,12 @@ class AWSY(TestingMixin, MercurialScript, TooltoolMixin, CodeCoverageMixin):
           "dest": "test_about_blank",
           "default": False,
           "help": "Runs the about:blank base case memory test.",
+          }],
+        [["--dmd"],
+         {"action": "store_true",
+          "dest": "dmd",
+          "default": False,
+          "help": "Runs tests with DMD enabled.",
           }]
     ] + testing_config_options + copy.deepcopy(code_coverage_config_options)
 
@@ -162,7 +168,7 @@ class AWSY(TestingMixin, MercurialScript, TooltoolMixin, CodeCoverageMixin):
             dmd_py_lib_dir = os.path.join(dmd_py_lib_dir, "../Resources/")
 
         dmd_path = os.path.join(dmd_py_lib_dir, "dmd.py")
-        if os.path.isfile(dmd_path):
+        if self.config['dmd'] and os.path.isfile(dmd_path):
             dmd_enabled = True
             runtime_testvars['dmd'] = True