New gamut GM, to test gamut conversion in various code-paths

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

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[SLAVE_BUILD]/skia/infra/bots/assets/skp/VERSION",
       "/path/to/tmp/"
     ],
     "name": "Get downloaded SKP VERSION"
@@ skipping 409 matching lines @@
       "gm",
       "_",
       "image-cacherator-from-ctable",
       "2ndpic-8888",
       "gm",
       "_",
       "image-cacherator-from-ctable",
       "serialize-8888",
       "gm",
       "_",
-      "image-cacherator-from-ctable"
+      "image-cacherator-from-ctable",
+      "sp-8888",
+      "gm",
+      "_",
+      "gamut",
+      "pic-8888",
+      "gm",
+      "_",
+      "gamut",
+      "lite-8888",
+      "gm",
+      "_",
+      "gamut",
+      "2ndpic-8888",
+      "gm",
+      "_",
+      "gamut",
+      "serialize-8888",
+      "gm",
+      "_",
+      "gamut"
     ],
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "SKIA_OUT": "[SLAVE_BUILD]/out"
     },
     "name": "dm",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",
       "@@@STEP_FAILURE@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "Failed build steps: dm",
     "recipe_result": null,
     "status_code": 1
   }
 ]