New Metrics constants for captive portal related UI
This patch adds 5 new constants in metrics_constants for counting
various UI interactions involving captive portals:
- sign-in button in wifi network details card
- captive portal login activity start up
- captive portal login activity menu interactions (2 constants)
- captive portal login activity auto-closes on portal dismissed
Bug:
34901696
Bug:
26303355
Test: compiled, flashed
Merged-In: I489e5f2f8ff27da60fed215fa5f51326933fd79e
(cherry pick from commit
11da42bbb63dba98515e6a3ca7c55e77cbb3c7bf)
Change-Id: Ifc553b08a65e78a630e235de087b7659a228bec8