Adding some unit tests to presubmit

Adding a test mapping file to run some unit tests when files are changed
under com/android/server. Starting off by putting
AlarmManagerServiceTest which has been stably passing for a while now.

Test: atest --test-mapping

Change-Id: I059ca4cba35202862137285352e03008d8321da8

services/core/java/com/android/server/TEST_MAPPING

@@ -0,0 +1,15 @@
+{
+    "presubmit": [
+        {
+            "name": "FrameworksMockingServicesTests",
+            "options": [
+                {
+                  "include-annotation": "android.platform.test.annotations.Presubmit"
+                },
+                {
+                  "exclude-annotation": "android.support.test.filters.FlakyTest"
+                }
+            ]
+        }
+    ]
+}

services/tests/mockingservicestests/src/com/android/server/AlarmManagerServiceTest.java

@@ -60,6 +60,7 @@ import android.os.Handler;
 import android.os.Looper;
 import android.os.PowerManager;
 import android.os.UserHandle;
+import android.platform.test.annotations.Presubmit;
 import android.provider.Settings;
 import android.util.Log;
 import android.util.SparseArray;
@@ -81,6 +82,7 @@ import org.mockito.quality.Strictness;
 
 import java.util.ArrayList;
 
+@Presubmit
 @SmallTest
 @RunWith(AndroidJUnit4.class)
 public class AlarmManagerServiceTest {