fixes deeplinking in uiscenedelegate migrated projects (flutter#170452)

fixes flutter#170350

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Author: gaaclarke

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterSceneDelegate.m

@@ -42,4 +42,42 @@ - (void)windowScene:(UIWindowScene*)windowScene
   }
 }
 
+static NSDictionary<UIApplicationOpenURLOptionsKey, id>* ConvertOptions(
+    UISceneOpenURLOptions* options) {
+  if (@available(iOS 14.5, *)) {
+    return @{
+      UIApplicationOpenURLOptionsSourceApplicationKey : options.sourceApplication
+          ? options.sourceApplication
+          : [NSNull null],
+      UIApplicationOpenURLOptionsAnnotationKey : options.annotation ? options.annotation
+                                                                    : [NSNull null],
+      UIApplicationOpenURLOptionsOpenInPlaceKey : @(options.openInPlace),
+      UIApplicationOpenURLOptionsEventAttributionKey : options.eventAttribution
+          ? options.eventAttribution
+          : [NSNull null],
+    };
+  } else {
+    return @{
+      UIApplicationOpenURLOptionsSourceApplicationKey : options.sourceApplication
+          ? options.sourceApplication
+          : [NSNull null],
+      UIApplicationOpenURLOptionsAnnotationKey : options.annotation ? options.annotation
+                                                                    : [NSNull null],
+      UIApplicationOpenURLOptionsOpenInPlaceKey : @(options.openInPlace),
+    };
+  }
+}
+
+- (void)scene:(UIScene*)scene openURLContexts:(NSSet<UIOpenURLContext*>*)URLContexts {
+  id appDelegate = FlutterSharedApplication.application.delegate;
+  if ([appDelegate respondsToSelector:@selector(lifeCycleDelegate)]) {
+    FlutterPluginAppLifeCycleDelegate* lifeCycleDelegate = [appDelegate lifeCycleDelegate];
+    for (UIOpenURLContext* context in URLContexts) {
+      [lifeCycleDelegate application:FlutterSharedApplication.application
+                             openURL:context.URL
+                             options:ConvertOptions(context.options)];
+    };
+  }
+}
+
 @end

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterSceneDelegateTest.m

@@ -42,4 +42,25 @@ - (void)testBridgeShortcut {
                                                       performActionForShortcutItem:[OCMArg any]
                                                                  completionHandler:[OCMArg any]]);
 }
+
+- (void)testOpenURL {
+  id mockApplication = OCMClassMock([UIApplication class]);
+  OCMStub([mockApplication sharedApplication]).andReturn(mockApplication);
+  id mockAppDelegate = OCMClassMock([FlutterAppDelegate class]);
+  id mockLifecycleDelegate = OCMClassMock([FlutterPluginAppLifeCycleDelegate class]);
+  OCMStub([mockApplication delegate]).andReturn(mockAppDelegate);
+  OCMStub([mockAppDelegate lifeCycleDelegate]).andReturn(mockLifecycleDelegate);
+  id windowScene = OCMClassMock([UIWindowScene class]);
+  id urlContext = OCMClassMock([UIOpenURLContext class]);
+  NSURL* url = [NSURL URLWithString:@"http://example.com"];
+  OCMStub([urlContext URL]).andReturn(url);
+
+  FlutterSceneDelegate* sceneDelegate = [[FlutterSceneDelegate alloc] init];
+  [sceneDelegate scene:windowScene openURLContexts:[NSSet setWithArray:@[ urlContext ]]];
+
+  OCMVerify([(FlutterPluginAppLifeCycleDelegate*)mockLifecycleDelegate application:[OCMArg any]
+                                                                           openURL:url
+                                                                           options:[OCMArg any]]);
+}
+
 @end