feat(fdc): Included platform detection changes (#17308)

Author: maneesht

packages/firebase_data_connect/firebase_data_connect/lib/src/common/common_library.dart

@@ -16,6 +16,10 @@ import 'dart:convert';
 
 import 'package:firebase_app_check/firebase_app_check.dart';
 
+import 'dart:io' show Platform;
+
+import 'package:flutter/foundation.dart';
+
 part 'dataconnect_error.dart';
 part 'dataconnect_options.dart';
 
@@ -26,7 +30,7 @@ String getGoogApiVal(CallerSDKType sdkType, String packageVersion) {
   if (sdkType == CallerSDKType.generated) {
     apiClientValue += ' dart/gen';
   }
-  return apiClientValue;
+  return '$apiClientValue gl-${kIsWeb ? 'web' : Platform.operatingSystem}';
 }
 
 String getFirebaseClientVal(String packageVersion) {

packages/firebase_data_connect/firebase_data_connect/test/src/common/common_library_test.dart

@@ -17,6 +17,7 @@ import 'package:firebase_data_connect/firebase_data_connect.dart';
 import 'package:firebase_data_connect/src/common/common_library.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/mockito.dart';
+import 'dart:io' show Platform;
 
 // Mock classes for Firebase dependencies
 
@@ -28,14 +29,14 @@ void main() {
       const packageVersion = '1.0.0';
       expect(
         getGoogApiVal(CallerSDKType.core, packageVersion),
-        'gl-dart/$packageVersion fire/$packageVersion',
+        'gl-dart/$packageVersion fire/$packageVersion gl-${Platform.operatingSystem}',
       );
     });
     test('should return codegen suffix if using gen sdk', () {
       const packageVersion = '1.0.0';
       expect(
         getGoogApiVal(CallerSDKType.generated, packageVersion),
-        'gl-dart/$packageVersion fire/$packageVersion dart/gen',
+        'gl-dart/$packageVersion fire/$packageVersion dart/gen gl-${Platform.operatingSystem}',
       );
     });
   });