Media Galleries: Access MTP devices by file ids rather than file paths.

chrome/browser/media_galleries/linux/snapshot_file_details.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media_galleries/linux/snapshot_file_details.h"
 
 #include "base/numerics/safe_conversions.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 //                             SnapshotRequestInfo                            //
 ////////////////////////////////////////////////////////////////////////////////
 
 SnapshotRequestInfo::SnapshotRequestInfo(
-    const std::string& device_file_path,
+    uint32 file_id,
     const base::FilePath& snapshot_file_path,
     const MTPDeviceAsyncDelegate::CreateSnapshotFileSuccessCallback&
         success_callback,
     const MTPDeviceAsyncDelegate::ErrorCallback& error_callback)
-    : device_file_path(device_file_path),
+    : file_id(file_id),
       snapshot_file_path(snapshot_file_path),
       success_callback(success_callback),
       error_callback(error_callback) {
 }
 
 SnapshotRequestInfo::~SnapshotRequestInfo() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 //                             SnapshotFileDetails                            //
@@ skipping 29 matching lines @@
   return !error_occurred_ && (bytes_written_ == file_info_.size);
 }
 
 uint32 SnapshotFileDetails::BytesToRead() const {
   // Read data in 1MB chunks.
   static const uint32 kReadChunkSize = 1024 * 1024;
   return std::min(
       kReadChunkSize,
       base::checked_cast<uint32>(file_info_.size) - bytes_written_);
 }