Update Flutter Gallery Xcode project to a publishable state (#14309)

examples/flutter_gallery/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -107,10 +107,16 @@
       "idiom" : "ipad",
       "filename" : "Icon-App-83.5x83.5@2x.png",
       "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
     }
   ],
   "info" : {
     "version" : 1,
     "author" : "xcode"
   }
-} 
\ No newline at end of file
+}
\ No newline at end of file

examples/flutter_gallery/ios/Runner/Info.plist

@@ -11,7 +11,7 @@
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
-	<string>Gallery</string>
+	<string>Flutter Gallery</string>
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>

packages/flutter_tools/templates/create/ios.tmpl/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -107,6 +107,12 @@
       "idiom" : "ipad",
       "filename" : "Icon-App-83.5x83.5@2x.png",
       "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
     }
   ],
   "info" : {