Android - UMA for notification click latency via NotificationJobService

chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationPlatformBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationPlatformBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationPlatformBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationPlatformBridge.java
index 5bc1221c9ca81374c76449e1818badff75a434e6..e22d92d52e6fd0c20c6f4c51c138ee0efa0b5fb6 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationPlatformBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationPlatformBridge.java
@@ -43,6 +43,7 @@ import org.chromium.webapk.lib.client.WebApkValidator;
 
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.util.concurrent.TimeUnit;
 
 import javax.annotation.Nullable;
 
@@ -175,6 +176,7 @@ public class NotificationPlatformBridge {
                 return false;
             }
         }
+        recordJobStartDelayUMA(intent);
 
         String notificationId = intent.getStringExtra(NotificationConstants.EXTRA_NOTIFICATION_ID);
 
@@ -214,6 +216,17 @@ public class NotificationPlatformBridge {
         return false;
     }
 
+    private static void recordJobStartDelayUMA(Intent intent) {
+        if (intent.hasExtra(NotificationConstants.EXTRA_JOB_SCHEDULED_TIME_MS)
+                && intent.hasExtra(NotificationConstants.EXTRA_JOB_STARTED_TIME_MS)) {
+            long duration = intent.getLongExtra(NotificationConstants.EXTRA_JOB_STARTED_TIME_MS, -1)
+                    - intent.getLongExtra(NotificationConstants.EXTRA_JOB_SCHEDULED_TIME_MS, -1);
+            if (duration < 0) return; // Possible if device rebooted before job started.
+            RecordHistogram.recordMediumTimesHistogram(
+                    "Notifications.Android.JobStartDelay", duration, TimeUnit.MILLISECONDS);
+        }
+    }
+
     @Nullable
     static String getNotificationReply(Intent intent) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {