Reland 89038, but with a mocked out keychain (mac unit tests were timing out)

chrome/browser/sync/engine/syncapi.h

Index: chrome/browser/sync/engine/syncapi.h
diff --git a/chrome/browser/sync/engine/syncapi.h b/chrome/browser/sync/engine/syncapi.h
index ce18184dccf6ae73e284fa1b1f94a2a1768d9b29..211ce6cc9c55bc9017ce1086f338e1dddd5728bb 100644
--- a/chrome/browser/sync/engine/syncapi.h
+++ b/chrome/browser/sync/engine/syncapi.h
@@ -1034,6 +1034,13 @@ class SyncManager {
 
   UserShare* GetUserShare() const;
 
+  // Inform the cryptographer of the most recent passphrase and set of encrypted
+  // types (from nigori node), then ensure all data that needs encryption is
+  // encrypted with the appropriate passphrase.
+  // Note: opens a transaction and can trigger ON_PASSPHRASE_REQUIRED, so must
+  // only be called after syncapi has been initialized.
+  void RefreshEncryption();
+
   syncable::ModelTypeSet GetEncryptedDataTypes() const;
 
   // Uses a read-only transaction to determine if the directory being synced has