Add activities to handle external storage intents

Adds 2 activities with the appropriate intent-filters to handle intents
used to control OP_MANAGE_EXTERNAL_STORAGE:
* Generic activity to handle ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION
  which control all apps (that request MANAGE_EXTERNAL_STORAGE).
* App specific activity to handle
  ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION. The intent filter
  expects the name of the package as data in the intent.

Test: manual
Bug: 146425146
Change-Id: Iebc7d153eac6ffe0b9bd75196bc8ecf9cb687939
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index d5c0871..83ee3fd 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -139,6 +139,7 @@
     public static class AppMemoryUsageActivity extends SettingsActivity { /* empty */ }
     public static class OverlaySettingsActivity extends SettingsActivity { /* empty */ }
     public static class ManageExternalStorageActivity extends SettingsActivity { /* empty */ }
+    public static class AppManageExternalStorageActivity extends SettingsActivity { /* empty */ }
     public static class WriteSettingsActivity extends SettingsActivity { /* empty */ }
     public static class ChangeWifiStateActivity extends SettingsActivity { /* empty */ }
     public static class AppDrawOverlaySettingsActivity extends SettingsActivity { /* empty */ }
diff --git a/src/com/android/settings/core/gateway/SettingsGateway.java b/src/com/android/settings/core/gateway/SettingsGateway.java
index 1e97bdb..5ad8bb2 100644
--- a/src/com/android/settings/core/gateway/SettingsGateway.java
+++ b/src/com/android/settings/core/gateway/SettingsGateway.java
@@ -39,6 +39,7 @@
 import com.android.settings.applications.appinfo.AppInfoDashboardFragment;
 import com.android.settings.applications.appinfo.DrawOverlayDetails;
 import com.android.settings.applications.appinfo.ExternalSourcesDetails;
+import com.android.settings.applications.appinfo.ManageExternalStorageDetails;
 import com.android.settings.applications.appinfo.WriteSettingsDetails;
 import com.android.settings.applications.appops.BackgroundCheckSummary;
 import com.android.settings.applications.assist.ManageAssist;
@@ -256,6 +257,7 @@
             DrawOverlayDetails.class.getName(),
             WriteSettingsDetails.class.getName(),
             ExternalSourcesDetails.class.getName(),
+            ManageExternalStorageDetails.class.getName(),
             WallpaperTypeSettings.class.getName(),
             VrListenerSettings.class.getName(),
             PictureInPictureSettings.class.getName(),