Implement GetDisplayed on android M+

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

Index: chrome/android/java/src/org/chromium/chrome/browser/notifications/CustomNotificationBuilder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/notifications/CustomNotificationBuilder.java b/chrome/android/java/src/org/chromium/chrome/browser/notifications/CustomNotificationBuilder.java
index 36eff35989b4ff5e3e7d64401b4259ed22575cd3..e0f7ad1cf8b7a8fed2aa1337dfc135b868fbdd88 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/notifications/CustomNotificationBuilder.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/notifications/CustomNotificationBuilder.java
@@ -166,6 +166,9 @@ public class CustomNotificationBuilder extends NotificationBuilderBase {
             // Notification.Builder.setPublicVersion was added in Android L.
             builder.setPublicVersion(createPublicNotification(mContext));
         }
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            builder.setExtras(mExtras);
+        }
 
         Notification notification = builder.build();
         notification.bigContentView = bigView;