SyncFS: Introduce SyncFileSystemBackend

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 9cf7aafc6d5a6286c2d63dbcd35896cb5b94e537..4d71ea4adcd1975e8a05ae1f018c77591fbb8330 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -38,6 +38,7 @@ namespace base {
 class DictionaryValue;
 class FilePath;
 }
+
 namespace crypto {
 class CryptoModuleBlockingPasswordDelegate;
 }
@@ -69,6 +70,7 @@ class SelectFilePolicy;
 namespace fileapi {
 class ExternalMountPoints;
 class FileSystemBackend;
+class FileSystemOptions;
 }
 
 namespace content {
@@ -564,6 +566,7 @@ class CONTENT_EXPORT ContentBrowserClient {
   virtual void GetAdditionalFileSystemBackends(
       BrowserContext* browser_context,
       const base::FilePath& storage_partition_path,
+      const fileapi::FileSystemOptions& options,
       ScopedVector<fileapi::FileSystemBackend>* additional_backends) {}
 
   // Allows an embedder to return its own LocationProvider implementation.