Add metrics when photo picker opened

Bug: 218862369
Test: make statsd_testdrive
$ANDROID_HOST_OUT/bin/statsd_testdrive 90

Change-Id: I8f359a3df771e81fc276eb7b4e423aa491f2e70d
Merged-In: I8f359a3df771e81fc276eb7b4e423aa491f2e70d
5 files changed