chromium_tests: apply chromium.get_env() when running tests

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTWin_tester.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTWin_tester.json b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTWin_tester.json
index b2ae03cfc49d1a8e23341e8185b1386154c21184..6cfa66eed4e59ae9060de79de6c1b36d8be03eed 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTWin_tester.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTWin_tester.json
@@ -246,6 +246,9 @@
       "--output-json",
       "/path/to/tmp/json"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "find isolated tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -319,6 +322,9 @@
       "--",
       "--test-launcher-summary-output=${ISOLATED_OUTDIR}/output.json"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "[trigger] browser_tests on Windows-7-SP1",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -359,6 +365,9 @@
       "1",
       "browser_tests/Windows-7-SP1/ffffffffff/ClangToTWin tester/571"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "browser_tests on Windows-7-SP1",
     "~followup_annotations": [
       "@@@STEP_LINK@shard #0 isolated out@blah@@@"
@@ -384,6 +393,9 @@
       "--chrome-revision",
       "170242"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "Upload to test-results [browser_tests on Windows-7-SP1]"
   },
   {
@@ -394,6 +406,9 @@
       "--target",
       "Release"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "process_dumps"
   },
   {