[webview_flutter_platform_interface] Adds url to WebResourceError (flutter#4439)

Platform interface portion of flutter/packages#3884

Author: bparrishMines

packages/webview_flutter/webview_flutter_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.4.0
+
+* Adds support to retrieve the url from a web resource loading error. See `WebResourceError.url`.
+
 ## 2.3.1
 
 * Removes obsolete null checks on non-nullable values.

packages/webview_flutter/webview_flutter_platform_interface/lib/src/types/web_resource_error.dart

@@ -107,6 +107,7 @@ class WebResourceError {
     required this.description,
     this.errorType,
     this.isForMainFrame,
+    this.url,
   });
 
   /// Raw code of the error from the respective platform.
@@ -120,4 +121,7 @@ class WebResourceError {
 
   /// Whether the error originated from the main frame.
   final bool? isForMainFrame;
+
+  /// The URL for which the failing resource request was made.
+  final String? url;
 }

packages/webview_flutter/webview_flutter_platform_interface/pubspec.yaml

@@ -4,7 +4,7 @@ repository: https://github.com/flutter/packages/tree/main/packages/webview_flutt
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+webview_flutter%22
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 2.3.1
+version: 2.4.0
 
 environment:
   sdk: ">=2.18.0 <4.0.0"