MTP Streaming: Optimize block reading

chrome/browser/media_galleries/linux/mtp_device_task_helper.h

Index: chrome/browser/media_galleries/linux/mtp_device_task_helper.h
diff --git a/chrome/browser/media_galleries/linux/mtp_device_task_helper.h b/chrome/browser/media_galleries/linux/mtp_device_task_helper.h
index 9c1a8f6d8fd0634f9473c536076cd58b65ff616b..c1f5539cdee5e93ef98122f0110b9369db3bc143 100644
--- a/chrome/browser/media_galleries/linux/mtp_device_task_helper.h
+++ b/chrome/browser/media_galleries/linux/mtp_device_task_helper.h
@@ -137,6 +137,12 @@ class MTPDeviceTaskHelper {
       const std::vector<MtpFileEntry>& file_entries,
       bool error) const;
 
+  // Intermediate step to finish a ReadBytes request.
+  void OnGetFileInfoToReadBytes(
+      const MTPDeviceAsyncDelegate::ReadBytesRequest& request,
+      const MtpFileEntry& file_entry,
+      bool error);
+
   // Query callback for ReadBytes();
   //
   // If there is no error, |error| is set to false, the buffer within |request|
@@ -148,6 +154,7 @@ class MTPDeviceTaskHelper {
   // IO thread to notify the caller.
   void OnDidReadBytes(
       const MTPDeviceAsyncDelegate::ReadBytesRequest& request,
+      const base::File::Info& file_info,
       const std::string& data,
       bool error) const;