[fsp] Add support for reading directories.

chrome/common/extensions/api/file_system_provider_internal.idl

Index: chrome/common/extensions/api/file_system_provider_internal.idl
diff --git a/chrome/common/extensions/api/file_system_provider_internal.idl b/chrome/common/extensions/api/file_system_provider_internal.idl
index 30ebbc7ea78b1ff4d2549e78f4b59bfdcbc078eb..7a80d5b6c07e8ac313e86eefe36ab75c87b92391 100644
--- a/chrome/common/extensions/api/file_system_provider_internal.idl
+++ b/chrome/common/extensions/api/file_system_provider_internal.idl
@@ -33,6 +33,21 @@ namespace fileSystemProviderInternal {
         long fileSystemId,
         long requestId,
         fileSystemProvider.ProviderError error);
+
+    // Internal. Success callback of the <code>onReadDirectoryRequested</code>
+    // event. Can be called multiple times per request.
+    static void readDirectoryRequestedSuccess(
+        long fileSystemId,
+        long requestId,
+        fileSystemProvider.EntryMetadata[] entries,
+        boolean hasNext);
+
+    // Internal. Error callback of the <code>onReadDirectoryRequested</code>
+    // event. Must be called when reading a directory fails.
+    static void readDirectoryRequestedError(
+        long fileSystemId,
+        long requestId,
+        fileSystemProvider.ProviderError error);
   };
 };