For mozilla-mobile#960 - Adds metrics to measure if Fenix is the defa…

…ult browser

app/metrics.yaml

@@ -0,0 +1,20 @@
+# This file defines the metrics that are recorded by glean telemetry. They are
+# automatically converted to Kotlin code at build time using the `glean_parser`
+# PyPI package.
+
+$schema: moz://mozilla.org/schemas/glean/metrics/1-0-0
+
+metrics:
+  default_browser:
+    type: boolean
+    description: >
+      Is Fenix the default browser?
+    send_in_pings:
+    - metrics
+    bugs:
+    - 123456789
+    data_reviews:
+    - N/A
+    notification_emails:
+    - telemetry-client-dev@mozilla.com
+    expires: never

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

@@ -5,13 +5,19 @@ package org.mozilla.fenix.components.metrics
 
 import android.content.Context
 import mozilla.components.service.glean.Glean
+import mozilla.components.support.utils.Browsers
 import org.mozilla.fenix.BuildConfig
 import org.mozilla.fenix.utils.Settings
+import org.mozilla.fenix.debug.GleanMetrics.Metrics
 
 class GleanMetricsService(private val context: Context) : MetricsService {
     override fun start() {
         Glean.initialize(context)
         Glean.setUploadEnabled(IsGleanEnabled)
+
+        Metrics.apply {
+            defaultBrowser.set(Browsers.all(context).isDefaultBrowser)
+        }
     }
 
     override fun track(event: Event) { }