[fsp] Add support for reading directories.

chrome/common/extensions/api/file_system_provider.idl

Index: chrome/common/extensions/api/file_system_provider.idl
diff --git a/chrome/common/extensions/api/file_system_provider.idl b/chrome/common/extensions/api/file_system_provider.idl
index 5ca491161001b80fed59f47eebfa32e293c152c0..1e638bf2f92cf566cef023abc20d2e4e01f237be 100644
--- a/chrome/common/extensions/api/file_system_provider.idl
+++ b/chrome/common/extensions/api/file_system_provider.idl
@@ -69,6 +69,12 @@ namespace fileSystemProvider {
   // Success callback for the <code>onGetMetadataRequested</code> event.
   callback MetadataCallback = void(EntryMetadata metadata);
 
+  // Success callback for the <code>onDirectoryRequested</code> event. If more
+  // entries will be returned, then <code>hasNext</code> must be true, and it
+  // has to be called again with additional entries. If no more entries are
+  // available, then <code>hasNext</code> must be set to false.
+  callback EntriesCallback = void(ResourceEntry[] entries, bool hasNext);
+
   interface Functions {
     // Mounts a file system with the given <code>displayName</code>.
     // <code>displayName</code> will be shown in the left panel of
@@ -111,6 +117,16 @@ namespace fileSystemProvider {
         DOMString entryPath,
         MetadataCallback successCallback,
         ErrorCallback errorCallback);
+
+    // Raised when contents of a directory at <code>directoryPath</code> is

[benwells, 2014/05/05 01:07:24]

Grammar nit: should be "Raised when /the/ contents of a directory at ... /are/
requested. /The/ results should be returned..."

[mtomasz, 2014/05/07 04:57:30]

Done.

+    // requested. Results should be returned in chunks by calling the <code>
+    // successCallback</code> several times. In case of an error, <code>
+    // errorCallback</code> must be called.
+    [maxListeners=1] static void onReadDirectoryRequested(
+        long fileSystemId,
+        DOMString directoryPath,
+        EntriesCallback successCallback,
+        ErrorCallback errorCallback);
   };
 };