[Media Gallery] Added code to support mtp device media file system on Windows.

webkit/fileapi/file_system_file_util.h

 // Copyright (c) 2012 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 WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
 
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
@@ skipping 13 matching lines @@
 class FileSystemOperationContext;
 
 // A file utility interface that provides basic file utility methods for
 // FileSystem API.
 //
 // Layering structure of the FileSystemFileUtil was split out.
 // See http://crbug.com/128136 if you need it.
 class WEBKIT_STORAGE_EXPORT FileSystemFileUtil {
  public:
   // It will be implemented by each subclass such as FileSystemFileEnumerator.
-  class AbstractFileEnumerator {
+  class WEBKIT_STORAGE_EXPORT AbstractFileEnumerator {
    public:
     virtual ~AbstractFileEnumerator() {}
 
     // Returns an empty string if there are no more results.
     virtual FilePath Next() = 0;
 
     virtual int64 Size() = 0;
     virtual base::Time LastModifiedTime() = 0;
     virtual bool IsDirectory() = 0;
   };
 
   // A policy flag for CreateSnapshotFile.
   enum SnapshotFilePolicy {
     kSnapshotFileUnknown,
 
     // The implementation just uses the local file as the snapshot file.
     // The FileAPI backend does nothing on the returned file.
     kSnapshotFileLocal,
 
     // The implementation returns a temporary file as the snapshot file.
     // The FileAPI backend takes care of the lifetime of the returned file
     // and will delete when the last reference of the file is dropped.
     kSnapshotFileTemporary,
   };
 
-  class EmptyFileEnumerator : public AbstractFileEnumerator {
+  class WEBKIT_STORAGE_EXPORT EmptyFileEnumerator
+      : public AbstractFileEnumerator {
     virtual FilePath Next() OVERRIDE;
     virtual int64 Size() OVERRIDE;
     virtual base::Time LastModifiedTime() OVERRIDE;
     virtual bool IsDirectory() OVERRIDE;
   };
 
   virtual ~FileSystemFileUtil() {}
 
   // Creates or opens a file with the given flags.
   // If PLATFORM_FILE_CREATE is set in |file_flags| it always tries to create
@@ skipping 127 matching lines @@
  protected:
   FileSystemFileUtil() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FileSystemFileUtil);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_