[webview_flutter_platform_interface] Adds method to set overscroll mode (flutter#9099)

Platform interface portion of flutter/flutter#57090

## Pre-Review Checklist

[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.

Author: bparrishMines

packages/webview_flutter/webview_flutter_platform_interface/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 2.11.0
 
+* Adds support to set the over-scroll mode for the WebView. See `PlatformWebViewController.setOverScrollMode`.
 * Updates minimum supported SDK version to Flutter 3.22/Dart 3.4.
 
 ## 2.10.0

packages/webview_flutter/webview_flutter_platform_interface/lib/src/platform_webview_controller.dart

@@ -324,6 +324,13 @@ abstract class PlatformWebViewController extends PlatformInterface {
       'setOnJavaScriptTextInputDialog is not implemented on the current platform',
     );
   }
+
+  /// Sets the over-scroll mode for the WebView.
+  Future<void> setOverScrollMode(WebViewOverScrollMode mode) async {
+    throw UnimplementedError(
+      'setOverScrollMode is not implemented on the current platform',
+    );
+  }
 }
 
 /// Describes the parameters necessary for registering a JavaScript channel.

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

@@ -0,0 +1,16 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/// Defines the over-scroll behavior of a WebView.
+enum WebViewOverScrollMode {
+  /// Always allow a user to over-scroll the WebView.
+  always,
+
+  /// Allow a user to over-scroll the WebView only if the content is larger than
+  /// the viewport.
+  ifContentScrolls,
+
+  /// Never allow a user to over-scroll the WebView.
+  never,
+}

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

@@ -12,6 +12,7 @@ export 'javascript_mode.dart';
 export 'load_request_params.dart';
 export 'navigation_decision.dart';
 export 'navigation_request.dart';
+export 'over_scroll_mode.dart';
 export 'platform_navigation_delegate_creation_params.dart';
 export 'platform_webview_controller_creation_params.dart';
 export 'platform_webview_cookie_manager_creation_params.dart';

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: 2.10.0
+version: 2.11.0
 
 environment:
   sdk: ^3.4.0

packages/webview_flutter/webview_flutter_platform_interface/test/platform_webview_controller_test.dart

@@ -457,6 +457,19 @@ void main() {
       throwsUnimplementedError,
     );
   });
+
+  test(
+      'Default implementation of setOverScrollMode should throw unimplemented error',
+      () {
+    final PlatformWebViewController controller =
+        ExtendsPlatformWebViewController(
+            const PlatformWebViewControllerCreationParams());
+
+    expect(
+      () => controller.setOverScrollMode(WebViewOverScrollMode.always),
+      throwsUnimplementedError,
+    );
+  });
 }
 
 class MockWebViewPlatformWithMixin extends MockWebViewPlatform