Add debug logs to help clarify the issue

We receive translation doesn't work issues but we don't have enough
log information to help debugging the issue. To help clarify issue

- Add more information when dumpsys activity information
- We use Log.isLoggable() to control if the debug log need to be
printed. But for the development phase, we enable print log on the
debuggable ROM, we will delete it before platform release.

Bug: 181975692
Test: manual. adb shell dumpsys activity <myactivity> --translation
(Can find dumpsys result of sample app in bug 182433547)

Change-Id: I4a9a1667a544fc4d1654c5f297d365a8288b1f4a