chromium_tests: apply chromium.get_env() when running tests

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

Index: scripts/slave/recipes/chromium_trybot.expected/use_skia_patch_on_chromium_trybot.json
diff --git a/scripts/slave/recipes/chromium_trybot.expected/use_skia_patch_on_chromium_trybot.json b/scripts/slave/recipes/chromium_trybot.expected/use_skia_patch_on_chromium_trybot.json
index eb6cc135dc539906ed43eff64359693c8427a776..6cae358ba327b0dd9b16abbdad2c575aa1a93ac7 100644
--- a/scripts/slave/recipes/chromium_trybot.expected/use_skia_patch_on_chromium_trybot.json
+++ b/scripts/slave/recipes/chromium_trybot.expected/use_skia_patch_on_chromium_trybot.json
@@ -447,6 +447,9 @@
       "--output",
       "/path/to/tmp/json"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "webkit_lint (with patch)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -472,6 +475,9 @@
       "--output",
       "/path/to/tmp/json"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "webkit_python_tests (with patch)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -506,6 +512,9 @@
       "tryserver.chromium.win",
       "--debug-rwt-logging"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "webkit_tests (with patch)",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>Total executed: 9001<br/>@@@"
@@ -527,6 +536,9 @@
       "--gs-bucket",
       "gs://chromium-layout-test-archives"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\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/win_chromium_rel_ng/571/layout-test-results/results.html@@@",
@@ -541,6 +553,9 @@
       "--target",
       "Release"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
     "name": "process_dumps"
   },
   {