I have initially tested this on a Nexus 5 with Android 4.4 and could not reproduce the problem, i.e. the placeholder indentation works there. I was able to reproduce the problem on a Galaxy Nexus with Android 4.2. As you can see in this issue
, there was a bug in the Android web view that caused placeholder indentation to not work. This bug has been fixed in Android 4.4.
I hope this information is useful. Let me know should you have any other questions.