[google_maps_flutter_web] Add padding to newLatLngBounds implementation (flutter#3452)

## Description
This PR is implementing the `padding` argument to `fitBounds` which is called by `newLatLngBounds`.

## Related Issues
[flutter#122192](flutter#122192)

Author: jxstxn1

packages/google_maps_flutter/google_maps_flutter_web/AUTHORS

@@ -64,3 +64,4 @@ Aleksandr Yurkovskiy <sanekyy@gmail.com>
 Anton Borries <mail@antonborri.es>
 Alex Li <google@alexv525.com>
 Rahul Raj <64.rahulraj@gmail.com>
+Justin Baumann <me@jxstxn.dev>

packages/google_maps_flutter/google_maps_flutter_web/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.1
+
+* Adds padding support to `CameraUpdate.newLatLngBounds`. Issue [#122192](https://github.com/flutter/flutter/issues/122192).
+
 ## 0.5.0+1
 
 * Updates the README to mention that this package is the endorsed implementation

packages/google_maps_flutter/google_maps_flutter_web/example/integration_test/projection_test.dart

@@ -72,6 +72,60 @@ void main() {
         expect(coords.latitude, closeTo(19, _acceptableLatLngDelta));
         expect(coords.longitude, closeTo(26, _acceptableLatLngDelta));
       });
+
+      testWidgets('addPadding', (WidgetTester tester) async {
+        const LatLng initialMapCenter = LatLng(0, 0);
+        const double initialZoomLevel = 5;
+        const CameraPosition initialCameraPosition =
+            CameraPosition(target: initialMapCenter, zoom: initialZoomLevel);
+        final LatLngBounds zeroLatLngBounds = LatLngBounds(
+            southwest: const LatLng(0, 0), northeast: const LatLng(0, 0));
+        await tester.pumpWidget(
+          Directionality(
+            textDirection: TextDirection.ltr,
+            child: GoogleMap(
+              initialCameraPosition: initialCameraPosition,
+              onMapCreated: onMapCreated,
+            ),
+          ),
+        );
+        await tester.pumpAndSettle();
+
+        final GoogleMapController controller = await controllerCompleter.future;
+
+        final LatLngBounds firstVisibleRegion =
+            await controller.getVisibleRegion();
+
+        expect(firstVisibleRegion, isNotNull);
+        expect(firstVisibleRegion.southwest, isNotNull);
+        expect(firstVisibleRegion.northeast, isNotNull);
+        expect(firstVisibleRegion, isNot(zeroLatLngBounds));
+        expect(firstVisibleRegion.contains(initialMapCenter), isTrue);
+
+        const double padding = 0.1;
+        await controller.moveCamera(
+            CameraUpdate.newLatLngBounds(firstVisibleRegion, padding));
+        await tester.pumpAndSettle(const Duration(seconds: 3));
+
+        final LatLngBounds secondVisibleRegion =
+            await controller.getVisibleRegion();
+
+        expect(secondVisibleRegion, isNotNull);
+        expect(secondVisibleRegion, isNot(zeroLatLngBounds));
+        expect(
+          secondVisibleRegion,
+          isNot(firstVisibleRegion),
+        );
+        expect(secondVisibleRegion.contains(initialMapCenter), isTrue);
+        expect(
+          secondVisibleRegion.contains(firstVisibleRegion.northeast),
+          isTrue,
+        );
+        expect(
+          secondVisibleRegion.contains(firstVisibleRegion.southwest),
+          isTrue,
+        );
+      });
     });
 
     group('getScreenCoordinate', () {

packages/google_maps_flutter/google_maps_flutter_web/lib/src/convert.dart

@@ -447,14 +447,14 @@ void _applyCameraUpdate(gmaps.GMap map, CameraUpdate update) {
       final List<Object?> latLngPair = asJsonList(json[1]);
       final List<Object?> latLng1 = asJsonList(latLngPair[0]);
       final List<Object?> latLng2 = asJsonList(latLngPair[1]);
+      final double padding = json[2] as double;
       map.fitBounds(
         gmaps.LatLngBounds(
           gmaps.LatLng(latLng1[0] as num?, latLng1[1] as num?),
           gmaps.LatLng(latLng2[0] as num?, latLng2[1] as num?),
         ),
+        padding,
       );
-      // padding = json[2];
-      // Needs package:google_maps ^4.0.0 to adjust the padding in fitBounds
       break;
     case 'scrollBy':
       map.panBy(json[1] as num?, json[2] as num?);

packages/google_maps_flutter/google_maps_flutter_web/pubspec.yaml

@@ -2,7 +2,7 @@ name: google_maps_flutter_web
 description: Web platform implementation of google_maps_flutter
 repository: https://github.com/flutter/packages/tree/main/packages/google_maps_flutter/google_maps_flutter_web
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+maps%22
-version: 0.5.0+1
+version: 0.5.1
 
 environment:
   sdk: ">=2.18.0 <4.0.0"