chromium_tests: apply chromium.get_env() when running tests

scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTMac_tester.json

Index: scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTMac_tester.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTMac_tester.json b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTMac_tester.json
index c79a58cf26e66b938fd775fc9bdaa88389c26d7f..b58aafef2c5ea3060990adb4a9a66ecbc90a6536 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTMac_tester.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTMac_tester.json
@@ -238,6 +238,9 @@
       "--output-json",
       "/path/to/tmp/json"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "find isolated tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -311,6 +314,9 @@
       "--",
       "--test-launcher-summary-output=${ISOLATED_OUTDIR}/output.json"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "[trigger] browser_tests on Mac-10.9",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -351,6 +357,9 @@
       "1",
       "browser_tests/Mac-10.9/ffffffffff/ClangToTMac tester/571"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "browser_tests on Mac-10.9",
     "~followup_annotations": [
       "@@@STEP_LINK@shard #0 isolated out@blah@@@"
@@ -376,6 +385,9 @@
       "--chrome-revision",
       "170242"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
     "name": "Upload to test-results [browser_tests on Mac-10.9]"
   },
   {