Add missing test runner annotations

These tests are supposed to run even withotu @RunWith annocation, but
for better consistency we should have it there.

Bug: 110805255
Test: verified as follows. No new test failures.
    tapas adb LatinIME LatinIMETests arm64 userdebug && \
    DISABLE_PROGUARD=true make -j LatinIME && \
    adb install -r $OUT/system/app/LatinIME/LatinIME.apk && \
    atest LatinIMETests:com.android.inputmethod.latin.ContactsDictionaryUtilsTest && \
    atest LatinIMETests:com.android.inputmethod.latin.ContactsContentObserverTest
Change-Id: I5c115d57b2ad41642f5f9b09b0c0d8f8c12480b0

tests/src/com/android/inputmethod/latin/ContactsContentObserverTest.java

@@ -24,11 +24,13 @@ import static org.mockito.Mockito.when;
 
 import android.content.Context;
 import android.provider.ContactsContract.Contacts;
-import android.test.suitebuilder.annotation.SmallTest;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
 
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
@@ -38,6 +40,7 @@ import java.util.ArrayList;
  * Tests for {@link ContactsContentObserver}.
  */
 @SmallTest
+@RunWith(AndroidJUnit4.class)
 public class ContactsContentObserverTest {
     private static final int UPDATED_CONTACT_COUNT = 10;
     private static final int STALE_CONTACT_COUNT = 8;

tests/src/com/android/inputmethod/latin/ContactsDictionaryUtilsTest.java

@@ -20,9 +20,11 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
-import android.test.suitebuilder.annotation.SmallTest;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
 
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.util.Locale;
 
@@ -30,6 +32,7 @@ import java.util.Locale;
  * Tests for {@link ContactsDictionaryUtils}
  */
 @SmallTest
+@RunWith(AndroidJUnit4.class)
 public class ContactsDictionaryUtilsTest {
 
     @Test