Add option to share a result from face search

lib/ui/face_search_results_page.dart

@@ -1,8 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:photos/face_search_manager.dart';
 import 'package:photos/models/face.dart';
-import 'package:photos/ui/circular_network_image_widget.dart';
 import 'package:photos/ui/gallery.dart';
+import 'package:photos/ui/gallery_app_bar_widget.dart';
 
 class FaceSearchResultsPage extends StatelessWidget {
   final FaceSearchManager _faceSearchManager = FaceSearchManager.instance;
@@ -12,19 +12,19 @@ class FaceSearchResultsPage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    var gallery = Gallery(
+      asyncLoader: (offset, limit) =>
+          _faceSearchManager.getFaceSearchResults(face, offset, limit),
+      tagPrefix: "face_search_results",
+    );
     return Scaffold(
-      appBar: AppBar(
-        title: Text("Search results"),
-        actions: <Widget>[
-          CircularNetworkImageWidget(face.getThumbnailUrl(), 20),
-        ],
+      appBar: GalleryAppBarWidget(
+        gallery,
+        GalleryAppBarType.search_results,
+        "Search results",
       ),
       body: Container(
-        child: Gallery(
-          asyncLoader: (offset, limit) =>
-              _faceSearchManager.getFaceSearchResults(face, offset, limit),
-          tagPrefix: "face_search_results",
-        ),
+        child: gallery,
       ),
     );
   }

lib/ui/gallery_app_bar_widget.dart

@@ -17,6 +17,7 @@ enum GalleryAppBarType {
   homepage,
   local_folder,
   remote_folder,
+  search_results,
 }
 
 class GalleryAppBarWidget extends StatefulWidget
@@ -29,9 +30,9 @@ class GalleryAppBarWidget extends StatefulWidget
   GalleryAppBarWidget(
     this.gallery,
     this.type,
-    this.title,
+    this.title, [
     this.path,
-  );
+  ]);
 
   @override
   _GalleryAppBarWidgetState createState() => _GalleryAppBarWidgetState();
@@ -117,7 +118,8 @@ class _GalleryAppBarWidgetState extends State<GalleryAppBarWidget> {
   List<Widget> _getActions(BuildContext context) {
     List<Widget> actions = List<Widget>();
     if (_selectedFiles.isNotEmpty) {
-      if (widget.type != GalleryAppBarType.remote_folder) {
+      if (widget.type != GalleryAppBarType.remote_folder &&
+          widget.type != GalleryAppBarType.search_results) {
         actions.add(IconButton(
           icon: Icon(Icons.delete),
           onPressed: () {