Set isolated server property in swarming/staging's builders

This is to fix failures like https://luci-logdog-dev.appspot.com/logs/chromium/buildbucket/cr-buildbucket-dev.appspot.com/8870257532584800912/+/u/RECIPE_CRASH__Uncaught_exception_/logging

Bug: 894045
Change-Id: I2d6e6dde6bf0194794c4723f88eaf6e886a7b243
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392020Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Ye Kuang <yekuang@google.com>
Cr-Commit-Position: refs/heads/master@{#804027}

infra/config/dev/subprojects/chromium/ci.star

@@ -55,6 +55,11 @@ def ci_builder(*, name, **kwargs):
         resultdb_bigquery_exports = [resultdb.export_test_results(
             bq_table = "luci-resultdb-dev.chromium.ci_test_results",
         )],
+        properties = {
+            "$recipe_engine/isolated": {
+                "server": "https://isolateserver-dev.appspot.com",
+            },
+        },
         **kwargs
     )
 

infra/config/generated/cr-buildbucket-dev.cfg

@@ -32,6 +32,7 @@ buckets {
         name: "swarming/staging"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$recipe_engine/isolated:{\"server\":\"https://isolateserver-dev.appspot.com\"}"
         properties_j: "builder_group:\"chromium.dev\""
       }
       execution_timeout_secs: 10800
@@ -57,6 +58,7 @@ buckets {
         name: "swarming/staging"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$recipe_engine/isolated:{\"server\":\"https://isolateserver-dev.appspot.com\"}"
         properties_j: "builder_group:\"chromium.dev\""
       }
       execution_timeout_secs: 10800
@@ -82,6 +84,7 @@ buckets {
         name: "swarming/staging"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$recipe_engine/isolated:{\"server\":\"https://isolateserver-dev.appspot.com\"}"
         properties_j: "builder_group:\"chromium.dev\""
       }
       execution_timeout_secs: 10800
@@ -108,6 +111,7 @@ buckets {
         name: "swarming/staging"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$recipe_engine/isolated:{\"server\":\"https://isolateserver-dev.appspot.com\"}"
         properties_j: "builder_group:\"chromium.dev\""
       }
       execution_timeout_secs: 10800
@@ -133,6 +137,7 @@ buckets {
         name: "swarming/staging"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$recipe_engine/isolated:{\"server\":\"https://isolateserver-dev.appspot.com\"}"
         properties_j: "builder_group:\"chromium.dev\""
       }
       execution_timeout_secs: 10800
@@ -158,6 +163,7 @@ buckets {
         name: "swarming/staging"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$recipe_engine/isolated:{\"server\":\"https://isolateserver-dev.appspot.com\"}"
         properties_j: "builder_group:\"chromium.dev\""
       }
       execution_timeout_secs: 10800
@@ -183,6 +189,7 @@ buckets {
         name: "swarming/staging"
         cipd_package: "infra/recipe_bundles/chromium.googlesource.com/chromium/tools/build"
         cipd_version: "refs/heads/master"
+        properties_j: "$recipe_engine/isolated:{\"server\":\"https://isolateserver-dev.appspot.com\"}"
         properties_j: "builder_group:\"chromium.dev\""
       }
       execution_timeout_secs: 10800