Add Mac AMD experimental bot

Bug: chromium:1382149
Change-Id: I4652585abee747d4a9a738a679deefb7ae57f64f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4300871
Auto-Submit: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Roman Lavrov <romanl@google.com>
Commit-Queue: Roman Lavrov <romanl@google.com>

infra/specs/angle.json

@@ -3971,6 +3971,7 @@
       }
     ]
   },
+  "mac-exp-amd": {},
   "mac-exp-intel": {},
   "mac-intel": {
     "gtest_tests": [

infra/specs/mixins.pyl

@@ -43,6 +43,12 @@
                                                                'display_attached': '1',
                                                                'gpu': '8086:3e9b',
                                                                'os': 'Mac-12.5'}}},
+  'mac_retina_amd_gpu_experimental': { 'swarming': { 'dimensions': { 'cpu': 'x86-64',
+                                                                     'display_attached': '1',
+                                                                     'gpu': '1002:6821',
+                                                                     'hidpi': '1',
+                                                                     'os': 'Mac-12.1',
+                                                                     'pool': 'chromium.tests.gpu'}}},
   'mac_retina_amd_gpu_stable': { 'swarming': { 'dimensions': { 'cpu': 'x86-64',
                                                                'display_attached': '1',
                                                                'gpu': '1002:6821',

infra/specs/waterfalls.pyl

@@ -185,6 +185,14 @@
           'gtest_tests': 'mac_amd_and_intel_gtests',
         },
       },
+      'mac-exp-amd': {
+        'os_type': 'mac',
+        'mixins': [
+          'mac_retina_amd_gpu_experimental',
+        ],
+        'test_suites': {
+        },
+      },
       'mac-exp-intel': {
         'os_type': 'mac',
         'mixins': [

scripts/code_generation_hashes/Test_spec_JSON.json

@@ -1,10 +1,10 @@
 {
   "infra/specs/angle.json":
-    "ad834f2875a5f6426769008406f3769b",
+    "11199ab1fd2c2c86e85948cdb49455f0",
   "infra/specs/generate_test_spec_json.py":
     "b8dbb50c814b7fe05eb77cf6e376cee4",
   "infra/specs/mixins.pyl":
-    "6658d9d4545a240d5471ab5b412a182c",
+    "ac457876c235978539af9f37cb49658c",
   "infra/specs/test_suite_exceptions.pyl":
     "55886f8b6ae4122306ce42083c5126c7",
   "infra/specs/test_suites.pyl":
@@ -12,7 +12,7 @@
   "infra/specs/variants.pyl":
     "8cfcaa99fa07ad2a2d5d14f220fd5037",
   "infra/specs/waterfalls.pyl":
-    "8be5945fd496b2202202df3affb20f1e",
+    "47cb97b7a7f0e61140d4ff869b14c815",
   "testing/buildbot/generate_buildbot_json.py":
     "86b1e0341794b275f2142a3a32db7bbe",
   "testing/buildbot/mixins.pyl":