Extract ChooserActivity "content preview" logic. am: 44b7053c23

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/IntentResolver/+/20440066

Change-Id: I2778606c6353d1dcb33fc701a8d37ca24ea631fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>