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

chrome/browser/media_galleries/linux/snapshot_file_details.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_LINUX_SNAPSHOT_FILE_DETAILS_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_LINUX_SNAPSHOT_FILE_DETAILS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h"
 
 // Used to represent snapshot file request params.
 struct 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);
   ~SnapshotRequestInfo();
 
-  // MTP device file path.
-  const std::string device_file_path;
+  // MTP device file id.
+  const uint32 file_id;
 
   // Local platform path of the snapshot file.
   const base::FilePath snapshot_file_path;
 
   // A callback to be called when CreateSnapshotFile() succeeds.
   const MTPDeviceAsyncDelegate::CreateSnapshotFileSuccessCallback
       success_callback;
 
   // A callback to be called when CreateSnapshotFile() fails.
   const MTPDeviceAsyncDelegate::ErrorCallback error_callback;
 };
 
 // SnapshotFileDetails tracks the current state of the snapshot file (e.g how
 // many bytes written to the snapshot file, source file details, snapshot file
 // metadata information, etc).
 class SnapshotFileDetails {
  public:
   SnapshotFileDetails(const SnapshotRequestInfo& request_info,
                       const base::File::Info& file_info);
 
   ~SnapshotFileDetails();
 
-  std::string device_file_path() const {
-    return request_info_.device_file_path;
+  uint32 file_id() const {
+    return request_info_.file_id;
   }
 
   base::FilePath snapshot_file_path() const {
     return request_info_.snapshot_file_path;
   }
 
   uint32 bytes_written() const {
     return bytes_written_;
   }
 
@@ skipping 41 matching lines @@
   // Number of bytes written into the snapshot file.
   uint32 bytes_written_;
 
   // Whether an error occurred during file transfer.
   bool error_occurred_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotFileDetails);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_SNAPSHOT_FILE_DETAILS_H_