AOSP/Email and AOSP/UnfiedEmail - Added back call to uiaccounts.
+ Added android.permission.FOREGROUND_SERVICE for UnfiedEmail and changed the
  code accordingly to work with API level 28.

Bug: 138276176
Bug: 119499886

Test: manual - Ran the following tests on Pixel phone. Tested the email UI.

$ make -j 40
$ make UnifiedEmail -j
$ make Email -j
$ make EmailTests -j

$ ls -l out/target/product/marlin/testcases/Email/arm64/Email.apk out/target/product/marlin/testcases/EmailTests/arm64/EmailTests.apk
  -rw-r--r-- 1 rtenneti primarygroup 6275529 Aug 15 11:33 out/target/product/marlin/testcases/Email/arm64/Email.apk
  -rw-r--r-- 1 rtenneti primarygroup  389599 Aug 15 11:42 out/target/product/marlin/testcases/EmailTests/arm64/EmailTests.apk

$ adb install -r -d -g out/target/product/marlin/testcases/Email/arm64/Email.apk
$ adb install -r -d -g out/target/product/marlin/testcases/EmailTests/arm64/EmailTests.apk
$ adb shell am instrument -w com.android.email.tests
  Time: 6.543
  OK (157 tests)

$ atest EmailTests
  Summary
  -------
  EmailTests: Passed: 157, Failed: 0, Ignored: 0, Assumption Failed: 0
  All tests passed!

Change-Id: Idd458f575c7c4b57a35c40c2ec7b8da048fbed72
diff --git a/provider_src/com/android/email/provider/EmailProvider.java b/provider_src/com/android/email/provider/EmailProvider.java
index 9dd2d2e..aadc51b 100644
--- a/provider_src/com/android/email/provider/EmailProvider.java
+++ b/provider_src/com/android/email/provider/EmailProvider.java
@@ -1317,10 +1317,8 @@
                             uri.getQueryParameter(EmailContent.SUPPRESS_COMBINED_ACCOUNT_PARAM);
                     final boolean suppressCombined =
                             suppressParam != null && Boolean.parseBoolean(suppressParam);
-                    // TODO(rtenneti): Enable notifications.
-                    // c = uiAccounts(projection, suppressCombined);
-                    // return c;
-                    return null;
+                    c = uiAccounts(projection, suppressCombined);
+                    return c;
                 case UI_UNDO:
                     return uiUndo(projection);
                 case UI_SUBFOLDERS: