With this CL, EditTextVariations is able to send Direct Repply
notification so that we can easily test IME behaviors there.

You don't need to set up a chat application then let it receive a
message from someone else any more just to test IME behaviors on
Direct Reply.

Fix: 122957841
Test: manually done as follows.
  1. tapas EditTextVariations
  2. make -j
  3. adb install -r \
     $ANDROID_TARGET_OUT_TESTCASES/EditTextVariations/EditTextVariations.apk
  4. Open EditTextVariations
  5. Tap the menu icon.
  6. Select "Direct Reply"
  7. Make sure that there is a Direct Reply notification.
Change-Id: Iafffcc7d138b0f502116a5e557f0c3f17e9d0b73