[google_sign_in] Add new Oauth scope methods to google_sign_in_platform_interface. (#2547)

diff --git a/packages/google_sign_in/google_sign_in_platform_interface/CHANGELOG.md b/packages/google_sign_in/google_sign_in_platform_interface/CHANGELOG.md
index 7819e74..c0627df 100644
--- a/packages/google_sign_in/google_sign_in_platform_interface/CHANGELOG.md
+++ b/packages/google_sign_in/google_sign_in_platform_interface/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 1.1.0
+
+* Add hasRequestedScope method to determine if an Oauth scope has been granted.
+* Add requestScope Method to request new Oauth scopes be granted by the user.
+
 ## 1.0.4
 
 * Make the pedantic dev_dependency explicit.

diff --git a/packages/google_sign_in/google_sign_in_platform_interface/lib/google_sign_in_platform_interface.dart b/packages/google_sign_in/google_sign_in_platform_interface/lib/google_sign_in_platform_interface.dart
index 0123015..966e935 100644
--- a/packages/google_sign_in/google_sign_in_platform_interface/lib/google_sign_in_platform_interface.dart
+++ b/packages/google_sign_in/google_sign_in_platform_interface/lib/google_sign_in_platform_interface.dart

@@ -121,4 +121,12 @@
   Future<void> clearAuthCache({@required String token}) async {
     throw UnimplementedError('clearAuthCache() has not been implemented.');
   }
+
+  /// Requests the user grants additional Oauth [scopes].
+  ///
+  /// Scopes should come from the full  list
+  /// [here](https://developers.google.com/identity/protocols/googlescopes).
+  Future<bool> requestScopes(List<String> scopes) async {
+    throw UnimplementedError('requestScopes() has not been implmented.');
+  }
 }

diff --git a/packages/google_sign_in/google_sign_in_platform_interface/lib/src/method_channel_google_sign_in.dart b/packages/google_sign_in/google_sign_in_platform_interface/lib/src/method_channel_google_sign_in.dart
index 1d1eb64..4d2a34f 100644
--- a/packages/google_sign_in/google_sign_in_platform_interface/lib/src/method_channel_google_sign_in.dart
+++ b/packages/google_sign_in/google_sign_in_platform_interface/lib/src/method_channel_google_sign_in.dart

@@ -78,4 +78,12 @@
       <String, String>{'token': token},
     );
   }
+
+  @override
+  Future<bool> requestScopes(List<String> scopes) {
+    return channel.invokeMethod<bool>(
+      'requestScopes',
+      <String, List<String>>{'scopes': scopes},
+    );
+  }
 }

diff --git a/packages/google_sign_in/google_sign_in_platform_interface/pubspec.yaml b/packages/google_sign_in/google_sign_in_platform_interface/pubspec.yaml
index 23937e2..d1f7abc 100644
--- a/packages/google_sign_in/google_sign_in_platform_interface/pubspec.yaml
+++ b/packages/google_sign_in/google_sign_in_platform_interface/pubspec.yaml

@@ -3,7 +3,7 @@
 homepage: https://github.com/flutter/plugins/tree/master/packages/google_sign_in/google_sign_in_platform_interface
 # 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: 1.0.4
+version: 1.1.0
 
 dependencies:
   flutter:

diff --git a/packages/google_sign_in/google_sign_in_platform_interface/test/method_channel_google_sign_in_test.dart b/packages/google_sign_in/google_sign_in_platform_interface/test/method_channel_google_sign_in_test.dart
index 13de6ac..6a8f7373 100644
--- a/packages/google_sign_in/google_sign_in_platform_interface/test/method_channel_google_sign_in_test.dart
+++ b/packages/google_sign_in/google_sign_in_platform_interface/test/method_channel_google_sign_in_test.dart

@@ -114,6 +114,11 @@
         }: isMethodCall('clearAuthCache', arguments: <String, dynamic>{
           'token': 'abc',
         }),
+        () {
+          googleSignIn.requestScopes(['newScope', 'anotherScope']);
+        }: isMethodCall('requestScopes', arguments: <String, dynamic>{
+          'scopes': ['newScope', 'anotherScope'],
+        }),
         googleSignIn.signOut: isMethodCall('signOut', arguments: null),
         googleSignIn.disconnect: isMethodCall('disconnect', arguments: null),
         googleSignIn.isSignedIn: isMethodCall('isSignedIn', arguments: null),