Add swarmed Pixel VR tests to VR FYI bot

Adds two swarming test triggers to the VR FYI bot to run the VR
instrumentation tests on the swarmed Pixel XLs. This is to make
sure that everything runs smoothly on them before going through
the effort to set up a Pixel XL tester on the main waterfall.

Bug: 739935
Change-Id: Ifdb9c6c24489a4883e7dff20566cbeb107c34ce1
Reviewed-on: https://chromium-review.googlesource.com/562896Reviewed-by: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#484971}

testing/buildbot/chromium.fyi.json

@@ -289,6 +289,44 @@
         },
         "test": "chrome_public_test_vr_apk"
       },
+      {
+        "args": [
+          "--shared-prefs-file=../../chrome/android/shared_preference_files/test/vr_cardboard_skipdon_setupcomplete.json",
+          "--replace-system-package=com.google.vr.vrcore,../../third_party/gvr-android-sdk/test-apks/vr_services/vr_services_current.apk"
+        ],
+        "name": "chrome_public_test_vr_apk-marlin-cardboard-nougat",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "android_devices": "1",
+              "device_os": "NMF26U",
+              "device_type": "marlin"
+            }
+          ],
+          "hard_timeout": 960
+        },
+        "test": "chrome_public_test_vr_apk"
+      },
+      {
+        "args": [
+          "--shared-prefs-file=../../chrome/android/shared_preference_files/test/vr_ddview_skipdon_setupcomplete.json",
+          "--replace-system-package=com.google.vr.vrcore,../../third_party/gvr-android-sdk/test-apks/vr_services/vr_services_current.apk"
+        ],
+        "name": "chrome_public_test_vr_apk-marlin-ddview-nougat",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "android_devices": "1",
+              "device_os": "NMF26U",
+              "device_type": "marlin"
+            }
+          ],
+          "hard_timeout": 960
+        },
+        "test": "chrome_public_test_vr_apk"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": false