Implement PermissionService::GetNextPermissionChange.

android_webview/browser/aw_permission_manager.cc

Index: android_webview/browser/aw_permission_manager.cc
diff --git a/android_webview/browser/aw_permission_manager.cc b/android_webview/browser/aw_permission_manager.cc
index 4e78af4c397528bda6b17eca5e54e9ebe10656d7..eb517b41083261ea53a6da54a7ab538f53b5a333 100644
--- a/android_webview/browser/aw_permission_manager.cc
+++ b/android_webview/browser/aw_permission_manager.cc
@@ -124,4 +124,16 @@ void AwPermissionManager::RegisterPermissionUsage(
     const GURL& embedding_origin) {
 }
 
+int AwPermissionManager::SubscribePermissionStatusChange(
+    content::PermissionType permission,
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    const base::Callback<void(content::PermissionStatus)>& callback) {
+  return -1;
+}
+
+void AwPermissionManager::UnsubscribePermissionStatusChange(
+    int subscription_id) {
+}
+
 }  // namespace android_webview