Set default FCM icon

Change-Id: Icebe6dfdb07d9649667f1c59beb157249f8f8445

Author: kroikie

messaging/app/src/main/AndroidManifest.xml

@@ -7,6 +7,14 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme">
+        <!-- [START fcm_default_icon] -->
+        <meta-data
+            android:name="com.google.firebase.messaging.default_notification_icon"
+            android:resource="@drawable/ic_stat_ic_notification" />
+        <meta-data
+            android:name="com.google.firebase.messaging.default_notification_color"
+            android:resource="@color/colorAccent" />
+        <!-- [END fcm_default_icon] -->
         <activity
             android:name="com.google.firebase.quickstart.fcm.MainActivity"
             android:label="@string/app_name">