Add support to parse first instance of the Oauth Android Client Id

Testing Done:
$ blaze test firebase/app/client/cpp:generate_xml_from_google_services_json_test

PiperOrigin-RevId: 310193460

Author: Googler

generate_xml_from_google_services_json.exe

@@ -48,7 +48,7 @@
 # Output filename for .json files, if it isn't set.
 DEFAULT_JSON_OUTPUT_FILENAME = 'google-services-desktop.json'
 
-# Indicates a web client in the oauth_client list.
+OAUTH_CLIENT_TYPE_ANDROID_APP = 1
 OAUTH_CLIENT_TYPE_WEB = 3
 
 
@@ -391,15 +391,24 @@ def main():
     if client_info:
       gen_string(root, 'google_app_id', client_info.get('mobilesdk_app_id'))
 
+    # Only include the first matching OAuth client ID per type.
+    client_id_web_parsed = False
+    client_id_android_parsed = False
+
     oauth_client_list = selected_client.get('oauth_client')
     if oauth_client_list:
       for oauth_client in oauth_client_list:
         client_type = oauth_client.get('client_type')
         client_id = oauth_client.get('client_id')
-        if client_type and client_type == OAUTH_CLIENT_TYPE_WEB and client_id:
+        if not (client_type and client_id): continue
+        if (client_type == OAUTH_CLIENT_TYPE_WEB and
+            not client_id_web_parsed):
           gen_string(root, 'default_web_client_id', client_id)
-          # Only include the first matching OAuth web client ID.
-          break
+          client_id_web_parsed = True
+        if (client_type == OAUTH_CLIENT_TYPE_ANDROID_APP and
+            not client_id_android_parsed):
+          gen_string(root, 'default_android_client_id', client_id)
+          client_id_android_parsed = True
 
     services = selected_client.get('services')
     if services: