chromium_tests: apply chromium.get_env() when running tests

scripts/slave/recipes/chromium_trybot.expected/use_v8_patch_on_blink_trybot_test_failures.json

Index: scripts/slave/recipes/chromium_trybot.expected/use_v8_patch_on_blink_trybot_test_failures.json
diff --git a/scripts/slave/recipes/chromium_trybot.expected/use_v8_patch_on_blink_trybot_test_failures.json b/scripts/slave/recipes/chromium_trybot.expected/use_v8_patch_on_blink_trybot_test_failures.json
index 57612d0e1ed4e793950c4f6dc7b4ec916192d9a0..390db322553c4e51dc36e55ecf4bbbdaa0668921 100644
--- a/scripts/slave/recipes/chromium_trybot.expected/use_v8_patch_on_blink_trybot_test_failures.json
+++ b/scripts/slave/recipes/chromium_trybot.expected/use_v8_patch_on_blink_trybot_test_failures.json
@@ -422,6 +422,9 @@
       "--step-name",
       "webkit_tests (with patch)"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "webkit_tests (with patch)",
     "~followup_annotations": [
       "step returned non-zero exit code: 5",
@@ -445,6 +448,9 @@
       "--gs-bucket",
       "gs://chromium-layout-test-archives"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "archive_webkit_tests_results",
     "~followup_annotations": [
       "@@@STEP_LINK@layout_test_results@https://storage.googleapis.com/chromium-layout-test-archives/v8_linux_blink_rel/571/layout-test-results/results.html@@@",
@@ -484,6 +490,7 @@
       "--output_manifest"
     ],
     "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "bot_update (without patch)",
@@ -669,6 +676,9 @@
       "--skipped",
       "always"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "webkit_tests (without patch)",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>Total executed: 9001<br/>@@@"
@@ -680,6 +690,9 @@
       "-u",
       "import sys; sys.exit(1)"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "webkit_tests (retry summary)",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",