Add local metrics for message processing.

app/src/main/java/org/thoughtcrime/securesms/database/LocalMetricsDatabase.kt

@@ -136,7 +136,7 @@ class LocalMetricsDatabase private constructor(
             put(EVENT_ID, event.eventId)
             put(EVENT_NAME, event.eventName)
             put(SPLIT_NAME, split.name)
-            put(DURATION, split.duration)
+            put(DURATION, event.timeunit.convert(split.duration, TimeUnit.NANOSECONDS))
           }
         )
       }

app/src/main/java/org/thoughtcrime/securesms/database/model/LocalMetricsEvent.kt

@@ -1,12 +1,15 @@
 package org.thoughtcrime.securesms.database.model
 
+import java.util.concurrent.TimeUnit
+
 data class LocalMetricsEvent(
   val createdAt: Long,
   val eventId: String,
   val eventName: String,
-  val splits: MutableList<LocalMetricsSplit>
+  val splits: MutableList<LocalMetricsSplit>,
+  val timeunit: TimeUnit
 ) {
   override fun toString(): String {
-    return "[$eventName] total: ${splits.sumOf { it.duration }} | ${splits.map { it.toString() }.joinToString(", ")}"
+    return "[$eventName] total: ${splits.sumOf { timeunit.convert(it.duration, TimeUnit.NANOSECONDS) }} | ${splits.map { it.toString() }.joinToString(", ")}"
   }
 }

app/src/main/java/org/thoughtcrime/securesms/database/model/LocalMetricsSplit.kt

@@ -1,10 +1,13 @@
 package org.thoughtcrime.securesms.database.model
 
+import java.util.concurrent.TimeUnit
+
 data class LocalMetricsSplit(
   val name: String,
-  val duration: Long
+  val duration: Long,
+  val timeunit: TimeUnit = TimeUnit.MILLISECONDS
 ) {
   override fun toString(): String {
-    return "$name: $duration"
+    return "$name: ${timeunit.convert(duration, TimeUnit.NANOSECONDS)}"
   }
 }