Let extra apps launch channel settings.

Test: manual
Change-Id: I689c0b35224dffc306ecbfa6f25ad3f072cd4dba
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index a68b2a7..2ffc5db 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -2700,6 +2700,22 @@
                 android:value="com.android.settings.notification.AppNotificationSettings" />
         </activity>
 
+        <!-- Show channel-level notification settings (channel passed in as extras) -->
+        <activity android:name="Settings$ChannelNotificationSettingsActivity"
+                  android:label="@string/app_notifications_title"
+                  android:exported="true">
+            <intent-filter android:priority="1">
+                <action android:name="android.settings.CHANNEL_NOTIFICATION_SETTINGS" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+            <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
+                       android:value="com.android.settings.notification.ChannelNotificationSettings" />
+        </activity>
+
         <!-- Show Manual (from settings item) -->
         <activity android:name="ManualDisplayActivity"
                   android:label="@string/manual"