Include https for Google ID token.

Author: wmwong

appengine/endpoints/swagger.yaml

@@ -64,6 +64,11 @@ paths:
           # Your OAuth2 client's Client ID must be added here. You can add
           # multiple client IDs to accept tokens from multiple clients.
           - "YOUR-CLIENT-ID"
+      - google_id_token_https:
+          audiences:
+          # Your OAuth2 client's Client ID must be added here. You can add
+          # multiple client IDs to accept tokens from multiple clients.
+          - "YOUR-CLIENT-ID"
 definitions:
   echoMessage:
     properties:
@@ -97,9 +102,16 @@ securityDefinitions:
     x-jwks_uri: "https://www.googleapis.com/service_accounts/v1/jwk/YOUR-SERVICE-ACCOUNT-EMAIL"
   # This section configures authentication using Google OAuth2 ID Tokens.
   # ID Tokens can be obtained using OAuth2 clients, and can be used to access
-  # your API on behalf of a particular user.
+  # your API on behalf of a particular user. Depending on the account used to
+  # sign in, the x-issuer can either be accounts.google.com or
+  # https://accounts.google.com.
   google_id_token:
     authorizationUrl: ""
     flow: "implicit"
     type: "oauth2"
     x-issuer: "accounts.google.com"
+  google_id_token_https:
+    authorizationUrl: ""
+    flow: "implicit"
+    type: "oauth2"
+    x-issuer: "https://accounts.google.com"