chromium_tests: apply chromium.get_env() when running tests

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

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.linux",
       "--builder",
       "Android Tests",
@@ skipping 310 matching lines @@
     "name": "extract build"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::adb]/resources/list_devices.py",
       "['[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools/adb', 'devices']",
       "/path/to/tmp/json"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
+      "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
+    },
     "name": "List adb devices",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@[@@@",
       "@@@STEP_LOG_LINE@json.output@  \"014E1F310401C009\"@@@",
       "@@@STEP_LOG_LINE@json.output@]@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport subprocess\nimport sys\nadb_path = sys.argv[1]\nfor device in sys.argv[2:]:\n  print 'Attempting to root device %s ...' % (device)\n  subprocess.check_call([adb_path, '-s', device, 'root'])\n  subprocess.check_call([adb_path, '-s', device, 'wait-for-device'])\n  print 'Finished rooting device %s' % (device)\n",
       "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools/adb",
       "014E1F310401C009"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
+      "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
+    },
     "name": "Root devices",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import subprocess@@@",
       "@@@STEP_LOG_LINE@python.inline@import sys@@@",
       "@@@STEP_LOG_LINE@python.inline@adb_path = sys.argv[1]@@@",
       "@@@STEP_LOG_LINE@python.inline@for device in sys.argv[2:]:@@@",
       "@@@STEP_LOG_LINE@python.inline@  print 'Attempting to root device %s ...' % (device)@@@",
       "@@@STEP_LOG_LINE@python.inline@  subprocess.check_call([adb_path, '-s', device, 'root'])@@@",
       "@@@STEP_LOG_LINE@python.inline@  subprocess.check_call([adb_path, '-s', device, 'wait-for-device'])@@@",
@@ skipping 39 matching lines @@
       "Android Tests",
       "--build-number",
       "571",
       "--test-type",
       "base_junit_tests",
       "--test-results-server",
       "test-results.appspot.com",
       "--chrome-revision",
       "refs/heads/master@{#170242}"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
+      "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
+    },
     "name": "Upload to test-results [base_junit_tests]"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport glob, os, sys\nfor report in glob.glob(sys.argv[1]):\n  with open(report, 'r') as f:\n    for l in f.readlines():\n      print l\n  os.remove(report)\n",
       "[SLAVE_BUILD]/src/out/Release/test_logs/*.log"
     ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
+      "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
+    },
     "name": "test_report",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import glob, os, sys@@@",
       "@@@STEP_LOG_LINE@python.inline@for report in glob.glob(sys.argv[1]):@@@",
       "@@@STEP_LOG_LINE@python.inline@  with open(report, 'r') as f:@@@",
       "@@@STEP_LOG_LINE@python.inline@    for l in f.readlines():@@@",
       "@@@STEP_LOG_LINE@python.inline@      print l@@@",
       "@@@STEP_LOG_LINE@python.inline@  os.remove(report)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "1 tests failed: ['base_junit_tests']",
     "status_code": 1
   }
 ]