Look for an assets path specification in the Info.plist. (#5049)

shell/platform/darwin/ios/framework/Source/FlutterDartProject.mm

@@ -70,7 +70,11 @@ static blink::Settings DefaultSettingsForProcess() {
 
   // Checks to see if the flutter assets directory is already present.
   if (settings.assets_path.size() == 0) {
-    NSString* assetsPath = [[NSBundle mainBundle] pathForResource:@"flutter_assets" ofType:@""];
+    // The kernel assets will not be present in the Flutter frameworks bundle since it is not user
+    // editable. Instead, look inside the main bundle.
+    NSBundle* bundle = [NSBundle mainBundle];
+    NSString* assets_directory_name = [FlutterDartProject flutterAssetsName:bundle];
+    NSString* assetsPath = [bundle pathForResource:assets_directory_name ofType:@""];
 
     if (assetsPath.length > 0) {
       settings.assets_path = assetsPath.UTF8String;

shell/platform/darwin/ios/framework/Source/FlutterDartProject_Internal.h

@@ -15,6 +15,8 @@
 
 - (shell::RunConfiguration)runConfiguration;
 
++ (NSString*)flutterAssetsName:(NSBundle*)bundle;
+
 @end
 
 #endif  // SHELL_PLATFORM_IOS_FRAMEWORK_SOURCE_FLUTTERDARTPROJECT_INTERNAL_H_