Filter out Android system packages from Chrome OS notification settings.

components/arc/common/app.mojom

Index: components/arc/common/app.mojom
diff --git a/components/arc/common/app.mojom b/components/arc/common/app.mojom
index c38b53a209066167ae55d84fae8f26bcc88768ec..f9aed0b672d3e157eb550a36733293f2da2f536d 100644
--- a/components/arc/common/app.mojom
+++ b/components/arc/common/app.mojom
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// Next MinVersion: 11
+// Next MinVersion: 12
 
 module arc.mojom;
 
@@ -25,6 +25,7 @@ struct ArcPackageInfo {
   int64 last_backup_android_id;
   int64 last_backup_time;
   bool sync;  // true if package installation should be synced
+  [MinVersion=11] bool system;  // true if package is system package.
 };
 
 // Describes ARC app shortcut.