Add isChildDocument to MtpDocumentsProvider.

Bug: 32687127
Test: adb shell am instrument -w -e class com.android.mtp.MtpDocumentsProviderTest#testIsChildDocument com.android.mtp.tests/com.android.mtp.TestResultInstrumentation
Change-Id: I44ded3c73443735229a8b3465122f7e10c4da178
2 files changed
tree: e08d577b1b016843d3e70d4128824af8b4b36859
  1. jni/
  2. res/
  3. src/
  4. tests/
  5. Android.mk
  6. AndroidManifest.xml
  7. proguard.flags