Flush Channel IDs when Cookies get saved to a persistent backend

content/public/browser/cookie_store_factory.h

Index: content/public/browser/cookie_store_factory.h
diff --git a/content/public/browser/cookie_store_factory.h b/content/public/browser/cookie_store_factory.h
index 53da902cf49816762989eeefc0fee5fa282538a0..40e7808dd4be0b446ec212bde773f32109228560 100644
--- a/content/public/browser/cookie_store_factory.h
+++ b/content/public/browser/cookie_store_factory.h
@@ -18,6 +18,7 @@ class SequencedTaskRunner;
 }
 
 namespace net {
+class ChannelIDService;
 class CookieCryptoDelegate;
 class CookieMonsterDelegate;
 class CookieStore;
@@ -79,6 +80,11 @@ struct CONTENT_EXPORT CookieStoreConfig {
   // config.
   net::CookieCryptoDelegate* crypto_delegate;
 
+  // Provides the cookie store with a pointer to the corresponding
+  // ChannelIDService that should be used with that cookie store. The
+  // ChannelIDService must outlive any cookie store created with this config.
+  net::ChannelIDService* channel_id_service;
+
   // Callbacks for data load events will be performed on |client_task_runner|.
   // If nullptr, uses the task runner for BrowserThread::IO.
   //