Recipe fix for buildbotless bots

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2435803003

Review-Url: https://chromiumcodereview.appspot.com/2435803003

infra/bots/recipe_modules/vars/api.py

@@ -114,6 +114,7 @@ class SkiaVarsApi(recipe_api.RecipeApi):
     self.issue = None
     self.patchset = None
     if self.no_buildbot:
+      self.is_trybot = False
       if (self.m.properties.get('issue', '') and
           self.m.properties.get('patchset', '')):
         self.is_trybot = True

infra/bots/recipes/swarm_test.expected/nobuildbot.json

@@ -203,6 +203,7 @@
   },
   {
     "cmd": [
+      "catchsegv",
       "[SLAVE_BUILD]/out/Debug/dm",
       "--undefok",
       "--resourcePath",
@@ -492,11 +493,7 @@
       "_",
       "gamut"
     ],
-    "env": {
-      "BUILDTYPE": "Debug",
-      "CHROME_HEADLESS": "1",
-      "SKIA_OUT": "[SLAVE_BUILD]/out"
-    },
+    "cwd": "[SLAVE_BUILD]/skia",
     "name": "dm"
   },
   {