[Skia] Convert SKPs to a CIPD package

scripts/slave/recipes/skia/swarm_test.expected/legacy_skimage_version.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/skia/tools/buildbot_spec.py",
       "/path/to/tmp/json",
       "Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug"
     ],
     "cwd": "[SLAVE_BUILD]/skia",
@@ skipping 31 matching lines @@
       "@@@STEP_LOG_LINE@json.output@  \"upload_perf_results\": false@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
-      "[SLAVE_BUILD]/tmp/SKP_VERSION",
+      "[SLAVE_BUILD]/skia/infra/bots/assets/skp/VERSION",
       "/path/to/tmp/"
     ],
-    "name": "Get downloaded SKP_VERSION"
+    "name": "Get downloaded SKP VERSION"
   },
   {
     "cmd": [
+      "python",
+      "-u",
+      "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
+      "42",
+      "[SLAVE_BUILD]/tmp/SKP_VERSION"
+    ],
+    "name": "write SKP_VERSION"
+  },
+  {
+    "cmd": [
       "python",
       "-u",
       "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[SLAVE_BUILD]/tmp/SK_IMAGE_VERSION",
       "/path/to/tmp/"
     ],
     "name": "Get downloaded SK_IMAGE_VERSION"
   },
   {
     "cmd": [
@@ skipping 112 matching lines @@
     ]
   },
   {
     "cmd": [
       "catchsegv",
       "[SLAVE_BUILD]/out/Debug/dm",
       "--undefok",
       "--resourcePath",
       "[SLAVE_BUILD]/skia/resources",
       "--skps",
-      "[SLAVE_BUILD]/skps",
+      "[SLAVE_BUILD]/skp",
       "--images",
       "[SLAVE_BUILD]/images/dm",
       "--colorImages",
       "[SLAVE_BUILD]/images/colorspace",
       "--nameByHash",
       "--properties",
       "gitHash",
       "abc123",
       "master",
       "client.skia",
@@ skipping 31 matching lines @@
       "SKIA_OUT": "[SLAVE_BUILD]/out"
     },
     "name": "dm"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]