[Android] Run java unit tests on the android tester bots.

scripts/slave/recipes/android/tester.expected/android_rel_tests_recipe.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.chromium.linux",
       "--builder",
       "android_rel_tests_recipe",
@@ skipping 119 matching lines @@
     "cwd": "[SLAVE_BUILD]/src",
     "name": "git diff to analyze patch",
     "stdout": "/path/to/tmp/"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/src/build/gyp_chromium",
       "--analyzer",
-      "{\"files\": [\"foo.cc\"], \"targets\": [\"mojo_test_apk\", \"android_webview_test_apk\", \"chrome_shell_test_apk\", \"content_shell_test_apk\", \"telemetry_unittests\", \"telemetry_perf_unittests\"]}",
+      "{\"files\": [\"foo.cc\"], \"targets\": [\"mojo_test_apk\", \"android_webview_test_apk\", \"chrome_shell_test_apk\", \"content_shell_test_apk\", \"telemetry_unittests\", \"telemetry_perf_unittests\", \"junit_unit_tests\"]}",
       "/path/to/tmp/json"
     ],
     "env": {
       "GYP_DEFINES": "OS=android component=static_library fastbuild=1 gomadir='[BUILD]/goma' target_arch=arm use_goma=1"
     },
     "name": "analyze",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"build_targets\": [@@@",
       "@@@STEP_LOG_LINE@json.output@    \"breakpad_unittests\", @@@",
-      "@@@STEP_LOG_LINE@json.output@    \"chrome_shell_test_apk\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"chrome_shell_test_apk\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"junit_unit_tests\"@@@",
       "@@@STEP_LOG_LINE@json.output@  ], @@@",
       "@@@STEP_LOG_LINE@json.output@  \"status\": \"Found dependency\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"targets\": [@@@",
       "@@@STEP_LOG_LINE@json.output@    \"breakpad_unittests\", @@@",
-      "@@@STEP_LOG_LINE@json.output@    \"chrome_shell_test_apk\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"chrome_shell_test_apk\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"junit_unit_tests\"@@@",
       "@@@STEP_LOG_LINE@json.output@  ]@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "allow_subannotations": false,
     "cmd": [
       "[SLAVE_BUILD]/src/build/tree_truth.sh",
       "[SLAVE_BUILD]/src",
@@ skipping 12 matching lines @@
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma",
       "--goma-dir",
       "[BUILD]/goma",
       "--",
       "breakpad_unittests",
-      "chrome_shell_test_apk"
+      "chrome_shell_test_apk",
+      "junit_unit_tests"
     ],
     "env": {
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "compile"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 89 matching lines @@
       "chrome:chrome/test/data/android/device_files",
       "--verbose",
       "--release"
     ],
     "name": "Instrumentation test ChromeShellTest"
   },
   {
     "cmd": [
       "python",
       "-u",
+      "[SLAVE_BUILD]/src/build/android/test_runner.py",
+      "junit",
+      "-s",
+      "junit_unit_tests",
+      "--verbose"
+    ],
+    "env": {
+      "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
+    },
+    "name": "junit_unit_tests"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "[SLAVE_BUILD]/src/build/android/adb_logcat_printer.py",
       "--output-path",
       "[SLAVE_BUILD]/src/out/Release/full_log",
       "[SLAVE_BUILD]/src/out/logcat"
     ],
     "name": "logcat_dump"
   },
   {
     "cmd": [
       "python",
@@ skipping 48 matching lines @@
       "@@@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@@@"
     ]
   }
 ]