For #18852: Add metrics for default browser settings experiment.

(cherry picked from commit f693375270)

app/metrics.yaml

@@ -5377,3 +5377,18 @@ set_default_newtab_experiment:
     notification_emails:
       - fenix-core@mozilla.com
     expires: "2021-10-01"
+
+set_default_setting_experiment:
+  set_default_browser_clicked:
+    type: event
+    description: |
+      Set default browser was clicked from settings screen.
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/18852
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/19047
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2021-10-01"

app/src/main/java/org/mozilla/fenix/components/metrics/Event.kt

@@ -230,6 +230,7 @@ sealed class Event {
     object CloseExperimentCardClicked : Event()
     object ToolbarMenuShown : Event()
     object SetDefaultBrowserToolbarMenuClicked : Event()
+    object SetDefaultBrowserSettingsScreenClicked : Event()
 
     // Home menu interaction
     object HomeMenuSettingsItemClicked : Event()

app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt

@@ -56,6 +56,7 @@ import org.mozilla.fenix.GleanMetrics.SearchShortcuts
 import org.mozilla.fenix.GleanMetrics.SearchSuggestions
 import org.mozilla.fenix.GleanMetrics.SearchWidget
 import org.mozilla.fenix.GleanMetrics.SetDefaultNewtabExperiment
+import org.mozilla.fenix.GleanMetrics.SetDefaultSettingExperiment
 import org.mozilla.fenix.GleanMetrics.SyncAccount
 import org.mozilla.fenix.GleanMetrics.SyncAuth
 import org.mozilla.fenix.GleanMetrics.SyncedTabs
@@ -835,6 +836,9 @@ private val Event.wrapper: EventWrapper<*>?
         is Event.SetDefaultBrowserClicked -> EventWrapper<NoExtraKeys>(
             { SetDefaultNewtabExperiment.setDefaultBrowserClicked.record(it) }
         )
+        is Event.SetDefaultBrowserSettingsScreenClicked -> EventWrapper<NoExtraKeys>(
+            { SetDefaultSettingExperiment.setDefaultBrowserClicked.record(it) }
+        )
         is Event.HomeScreenDisplayed -> EventWrapper<NoExtraKeys>(
             { HomeScreen.homeScreenDisplayed.record(it) }
         )

app/src/main/java/org/mozilla/fenix/settings/SettingsFragment.kt

@@ -480,6 +480,9 @@ class SettingsFragment : PreferenceFragmentCompat() {
      */
     private fun getClickListenerForMakeDefaultBrowser(): Preference.OnPreferenceClickListener {
         return Preference.OnPreferenceClickListener {
+            if (isDefaultBrowserExperimentBranch() && !isFirefoxDefaultBrowser()) {
+                requireContext().metrics.track(Event.SetDefaultBrowserSettingsScreenClicked)
+            }
             activity?.openSetDefaultBrowserOption()
             true
         }

docs/metrics.md

@@ -212,6 +212,7 @@ In addition to those built-in metrics, the following metrics are added to the pi
 | search_widget.voice_button |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the microphone icon, opening a new voice search screen.  |[mozilla-mobile/fenix#4714](https://github.com/mozilla-mobile/fenix/pull/4714), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | set_default_newtab_experiment.close_experiment_card_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Close experiment card was clicked from new tab screen.  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
 | set_default_newtab_experiment.set_default_browser_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Set default browser was clicked from new tab screen.  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
+| set_default_setting_experiment.set_default_browser_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Set default browser was clicked from settings screen.  |[mozilla-mobile/fenix#19047](https://github.com/mozilla-mobile/fenix/pull/19047)||2021-10-01 |2 |
 | sync_account.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the sync account page  |[mozilla-mobile/fenix#2745](https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | sync_account.send_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user sent the current tab to another FxA device  |[mozilla-mobile/fenix#5106](https://github.com/mozilla-mobile/fenix/pull/5106), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | sync_account.sign_in_to_send_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the "sign in to send tab" button inside the share tab menu  |[mozilla-mobile/fenix#5106](https://github.com/mozilla-mobile/fenix/pull/5106), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |