Make MediaFileUtil run on thread pool.

webkit/fileapi/file_system_file_util_proxy.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_PROXY_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_PROXY_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 32 matching lines @@
   typedef FileSystemOperationInterface::ReadDirectoryCallback
       ReadDirectoryCallback;
 
   typedef base::Callback<
       void(base::PlatformFileError result,
            const base::PlatformFileInfo& file_info,
            const FilePath& platform_path,
            FileSystemFileUtil::SnapshotFilePolicy snapshot_policy)>
       SnapshotFileCallback;
 
-  // Deletes a file or a directory on the given context's file_task_runner.
+  // Deletes a file or a directory on the given context's task_runner.
   // It is an error to delete a non-empty directory with recursive=false.
   static bool Delete(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       bool recursive,
       const StatusCallback& callback);
 
   // Creates or opens a file with the given flags by calling |file_util|'s
-  // CreateOrOpen method on the given context's file_task_runner.
+  // CreateOrOpen method on the given context's task_runner.
   static bool CreateOrOpen(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       int file_flags,
       const CreateOrOpenCallback& callback);
 
   // Copies a file or a directory from |src_url| to |dest_url| by calling
   // FileSystemFileUtil's following methods on the given context's
-  // file_task_runner.
+  // task_runner.
   // - CopyOrMoveFile() for same-filesystem operations
   // - CopyInForeignFile() for (limited) cross-filesystem operations
   //
   // Error cases:
   // If destination's parent doesn't exist.
   // If source dir exists but destination url is an existing file.
   // If source file exists but destination url is an existing directory.
   // If source is a parent of destination.
   // If source doesn't exist.
   // If source and dest are the same url in the same filesystem.
   static bool Copy(
       FileSystemOperationContext* context,
       FileSystemFileUtil* src_util,
       FileSystemFileUtil* dest_util,
       const FileSystemURL& src_url,
       const FileSystemURL& dest_url,
       const StatusCallback& callback);
 
   // Moves a file or a directory from |src_url| to |dest_url| by calling
   // FileSystemFileUtil's following methods on the given context's
-  // file_task_runner.
+  // task_runner.
   // - CopyOrMoveFile() for same-filesystem operations
   // - CopyInForeignFile() for (limited) cross-filesystem operations
   //
   // This method returns an error on the same error cases with Copy.
   static bool Move(
       FileSystemOperationContext* context,
       FileSystemFileUtil* src_util,
       FileSystemFileUtil* dest_util,
       const FileSystemURL& src_url,
       const FileSystemURL& dest_url,
       const StatusCallback& callback);
 
   // Ensures that the given |url| exist by calling |file_util|'s
-  // EnsureFileExists method on the given context's file_task_runner.
+  // EnsureFileExists method on the given context's task_runner.
   static bool EnsureFileExists(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       const EnsureFileExistsCallback& callback);
 
   // Creates directory at a given url by calling |file_util|'s
-  // CreateDirectory method on the given context's file_task_runner.
+  // CreateDirectory method on the given context's task_runner.
   static bool CreateDirectory(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       bool exclusive,
       bool recursive,
       const StatusCallback& callback);
 
   // Retrieves the information about a file by calling |file_util|'s
-  // GetFileInfo method on the given context's file_task_runner.
+  // GetFileInfo method on the given context's task_runner.
   static bool GetFileInfo(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       const GetFileInfoCallback& callback);
 
   // Creates a snapshot file by calling |file_util|'s CreateSnapshotFile
-  // method on the given context's file_task_runner.
+  // method on the given context's task_runner.
   static bool CreateSnapshotFile(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       const SnapshotFileCallback& callback);
 
   // Reads the filenames in |url| by calling |file_util|'s
-  // ReadDirectory method on the given context's file_task_runner.
+  // ReadDirectory method on the given context's task_runner.
   // TODO: this should support returning entries in multiple chunks.
   static bool ReadDirectory(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       const ReadDirectoryCallback& callback);
 
   // Touches a file by calling |file_util|'s Touch method
-  // on the given context's file_task_runner.
+  // on the given context's task_runner.
   static bool Touch(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       const base::Time& last_access_time,
       const base::Time& last_modified_time,
       const StatusCallback& callback);
 
   // Truncates a file to the given length by calling |file_util|'s
-  // Truncate method on the given context's file_task_runner.
+  // Truncate method on the given context's task_runner.
   static bool Truncate(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemURL& url,
       int64 length,
       const StatusCallback& callback);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileSystemFileUtilProxy);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_PROXY_H_