Setup builder config to run LaCrOS tests on Skylab

Still in POC stage, make chromeos-amd64-generic-lacros-chrome
run an existing tast(tast.critical-chrome) on CrOS device via Skylab.

BUG=1139516
TEST=./generate_buildbot_json.py

Change-Id: I29b9df8610f587d067c3aba831679f16bb0a4f0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586073
Commit-Queue: Xinan Lin <linxinan@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840249}

testing/buildbot/internal.chromeos.fyi.json

@@ -4,6 +4,28 @@
   "chromeos-amd64-generic-lacros-chrome": {
     "additional_compile_targets": [
       "chrome"
+    ],
+    "skylab_tests": [
+      {
+        "args": [],
+        "cros_board": "octopus",
+        "cros_img": "octopus-release/R89-13668.0.0",
+        "name": "tast.critical-chrome_OCTOPUS_TOT",
+        "suite": "tast.critical-chrome",
+        "swarming": {},
+        "test": "tast.critical-chrome",
+        "timeout": 10800
+      },
+      {
+        "args": [],
+        "cros_board": "octopus",
+        "cros_img": "octopus-release/R88-13597.30.0",
+        "name": "tast.critical-chrome_OCTOPUS_TOT-1",
+        "suite": "tast.critical-chrome",
+        "swarming": {},
+        "test": "tast.critical-chrome",
+        "timeout": 10800
+      }
     ]
   },
   "chromeos-betty-arc-r-chrome": {

testing/buildbot/test_suites.pyl

@@ -1219,6 +1219,15 @@
       },
     },
 
+    'cros_skylab_chrome_critical': {
+      'tast.critical-chrome': {
+        # TODO(crbug/1139516): Update this once LaCrOS tast test is ready.
+        # A Tast suite, e.g. tast.informational-chrome.
+        'suite': 'tast.critical-chrome',
+        'timeout': 10800,
+      },
+    },
+
     'desktop_chromium_isolated_scripts': {
       'blink_python_tests': {
         'resultdb': {
@@ -6230,6 +6239,15 @@
       }
     },
 
+    'cros_skylab_chrome_critical_x86_64': {
+      'cros_skylab_chrome_critical': {
+        'variants': [
+          'CROS_OCTOPUS_TOT',
+          'CROS_OCTOPUS_TOT-1',
+        ]
+      },
+    },
+
     # ios14-beta-sim runs sims only on 14.0+ since
     # ios13-beta-sim already runs 13.x and 12.4
     'ios14_beta_simulator_tests': {

testing/buildbot/variants.pyl

@@ -445,4 +445,19 @@
       ],
     },
   },
-}
+  'CROS_OCTOPUS_TOT': {
\ No newline at end of file
+    'skylab': {
+      'cros_board': 'octopus',
+      # Find a released OS version at go/goldeneye.
+      'cros_img': 'octopus-release/R89-13668.0.0',
+    },
+    'identifier': 'OCTOPUS_TOT',
+  },
+  'CROS_OCTOPUS_TOT-1': {
+    'skylab': {
+      'cros_board': 'octopus',
+      'cros_img': 'octopus-release/R88-13597.30.0',
+    },
+    'identifier': 'OCTOPUS_TOT-1',
+  },
+}

testing/buildbot/waterfalls.pyl

@@ -6056,6 +6056,9 @@
         'additional_compile_targets': [
           'chrome',
         ],
+        'test_suites': {
+          'skylab_tests': 'cros_skylab_chrome_critical_x86_64',
+        },
       },
       'chromeos-betty-arc-r-chrome': {
         'additional_compile_targets': [