[Android] Adding UMA for events in Background Task Scheduler

chrome/android/java/src/org/chromium/chrome/browser/init/ProcessInitializationHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/init/ProcessInitializationHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/init/ProcessInitializationHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/init/ProcessInitializationHandler.java
index 40e18510582f79dd50d26609d0f1ae6e4075a7b3..ce22e1e992027aa914a49654b55e76f18271e880 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/init/ProcessInitializationHandler.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/init/ProcessInitializationHandler.java
@@ -73,6 +73,7 @@ import org.chromium.chrome.browser.sync.SyncController;
 import org.chromium.chrome.browser.webapps.ChromeWebApkHost;
 import org.chromium.chrome.browser.webapps.WebApkVersionManager;
 import org.chromium.chrome.browser.webapps.WebappRegistry;
+import org.chromium.components.background_task_scheduler.BackgroundTaskSchedulerFactory;
 import org.chromium.components.minidump_uploader.CrashFileManager;
 import org.chromium.components.signin.AccountManagerHelper;
 import org.chromium.content.browser.ChildProcessLauncher;
@@ -400,6 +401,13 @@ public class ProcessInitializationHandler {
                 }
             }
         });
+
+        deferredStartupHandler.addDeferredTask(new Runnable() {
+            @Override
+            public void run() {
+                BackgroundTaskSchedulerFactory.getScheduler().checkForOSUpgrade(application);
+            }
+        });
     }
 
     private void initChannelsAsync() {