Media Galleries: Cache file info during a directory read to service incoming requests to get file i…

chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h

Index: chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h
diff --git a/chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h b/chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h
index 44d390dfd4bca66436487b4a4ba1bcb851fc0bfc..770c0603b0175e36fb345a518b9665baba214282 100644
--- a/chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h
+++ b/chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h
@@ -60,6 +60,9 @@ class MTPDeviceDelegateImplLinux : public MTPDeviceAsyncDelegate {
   // Maps file ids to file nodes.
   typedef std::map<uint32, MTPFileNode*> FileIdToMTPFileNodeMap;
 
+  // Maps file paths to file info.
+  typedef std::map<base::FilePath, fileapi::DirectoryEntry> FileInfoCache;
+
   // Should only be called by CreateMTPDeviceAsyncDelegate() factory call.
   // Defer the device initializations until the first file operation request.
   // Do all the initializations in EnsureInitAndRunTask() function.
@@ -278,6 +281,11 @@ class MTPDeviceDelegateImplLinux : public MTPDeviceAsyncDelegate {
   // can return results over multiple callbacks, is in progress.
   std::set<std::string> child_nodes_seen_;
 
+  // A cache to store file metadata for file entries read during a ReadDirectory
+  // operation. Used to service incoming GetFileInfo calls for the duration of
+  // the ReadDirectory operation.
+  FileInfoCache file_info_cache_;
+
   // For callbacks that may run after destruction.
   base::WeakPtrFactory<MTPDeviceDelegateImplLinux> weak_ptr_factory_;