Initialize OSCrypt with a TaskRunner on the main thread

components/os_crypt/key_storage_linux.h

Index: components/os_crypt/key_storage_linux.h
diff --git a/components/os_crypt/key_storage_linux.h b/components/os_crypt/key_storage_linux.h
index 2791d75633b4b8a264705c1db6663b11e0294ecb..1808706f4d5e1ae427eecf6d5ca2edb66f357d1d 100644
--- a/components/os_crypt/key_storage_linux.h
+++ b/components/os_crypt/key_storage_linux.h
@@ -9,6 +9,8 @@
 #include <string>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 
 // An API for retrieving OSCrypt's password from the system's password storage
 // service.
@@ -23,6 +25,12 @@ class KeyStorageLinux {
   // The product name to use for permission prompts.
   static void SetProductName(const std::string& product_name);
 
+  // A runner on the main thread for gnome-keyring to be called from.
+  // TODO(crbug/466975): Libsecret and KWallet don't need this. We can remove
+  // this when we stop supporting keyring.
+  static void SetMainThreadRunner(
+      scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner);
+
   // Tries to load the appropriate key storage. Returns null if none succeed.
   static std::unique_ptr<KeyStorageLinux> CreateService();