Add host side test for apex-system-service.

The test installs a test apex with a fake system server and checks that
the service prints to logcat in onStart().

Bug: 192880996
Test: atest ApexSystemServicesTestCases
Change-Id: I7b9f353e30425302e83660f440affe5010944a9b
diff --git a/TEST_MAPPING b/TEST_MAPPING
index c5c6012..81e4fcb 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -17,6 +17,19 @@
   ],
   "presubmit": [
     {
+      "file_patterns": [
+        "ApexManager\\.java",
+        "SystemServer\\.java",
+        "services/tests/apexsystemservices/.*"
+      ],
+      "name": "ApexSystemServicesTestCases",
+      "options": [
+        {
+          "exclude-annotation": "androidx.test.filters.FlakyTest"
+        }
+      ]
+    },
+    {
       "name": "FrameworksUiServicesTests",
       "options": [
         {