demo of step.context bot_update issue

scripts/slave/recipes/blink_downstream.expected/webkit_tests_interrupted.json

Index: scripts/slave/recipes/blink_downstream.expected/webkit_tests_interrupted.json
diff --git a/scripts/slave/recipes/blink_downstream.expected/webkit_tests_interrupted.json b/scripts/slave/recipes/blink_downstream.expected/webkit_tests_interrupted.json
index 11f4df9d9c78d376a73536c066376e93c2430233..222417fcb3ac9dbb0e3d2831a6266aae1638a4e7 100644
--- a/scripts/slave/recipes/blink_downstream.expected/webkit_tests_interrupted.json
+++ b/scripts/slave/recipes/blink_downstream.expected/webkit_tests_interrupted.json
@@ -194,7 +194,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[BUILDER_CACHE]/V8_Blink_Linux_64/src",
+    "cwd": "[SLAVE_BUILD]/src",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "GYP_CHROMIUM_NO_ACTION": "1",
@@ -207,19 +207,19 @@
     "cmd": [
       "python",
       "-u",
-      "[BUILDER_CACHE]/V8_Blink_Linux_64/src/tools/mb/mb.py",
+      "[SLAVE_BUILD]/src/tools/mb/mb.py",
       "gen",
       "-m",
       "client.v8.fyi",
       "-b",
       "V8-Blink Linux 64",
       "--config-file",
-      "[BUILDER_CACHE]/V8_Blink_Linux_64/src/tools/mb/mb_config.pyl",
+      "[SLAVE_BUILD]/src/tools/mb/mb_config.pyl",
       "--goma-dir",
       "[CACHE]/cipd/goma",
       "//out/Release"
     ],
-    "cwd": "[BUILDER_CACHE]/V8_Blink_Linux_64/src",
+    "cwd": "[SLAVE_BUILD]/src",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
@@ -240,7 +240,7 @@
       "--target",
       "Release",
       "--src-dir",
-      "[BUILDER_CACHE]/V8_Blink_Linux_64/src",
+      "[SLAVE_BUILD]/src",
       "--goma-cache-dir",
       "[GOMA_CACHE]",
       "--goma-deps-cache-dir",
@@ -310,7 +310,7 @@
       "-o",
       "[SLAVE_BUILD]/layout-test-results",
       "--build-dir",
-      "[BUILDER_CACHE]/V8_Blink_Linux_64/src/out",
+      "[SLAVE_BUILD]/src/out",
       "--json-test-results",
       "/path/to/tmp/json",
       "--test-results-server",
@@ -323,7 +323,7 @@
       "webkit_tests (with patch)",
       "--no-pixel-tests",
       "--additional-expectations",
-      "[BUILDER_CACHE]/V8_Blink_Linux_64/src/v8/tools/blink_tests/TestExpectations"
+      "[SLAVE_BUILD]/src/v8/tools/blink_tests/TestExpectations"
     ],
     "cwd": "[BUILDER_CACHE]/V8_Blink_Linux_64",
     "name": "webkit_tests (with patch)",
@@ -341,7 +341,7 @@
       "--results-dir",
       "[SLAVE_BUILD]/layout-test-results",
       "--build-dir",
-      "[BUILDER_CACHE]/V8_Blink_Linux_64/src/out",
+      "[SLAVE_BUILD]/src/out",
       "--build-number",
       "571",
       "--builder-name",