Change webkit/{fileapi,quota} code to use TaskRunner.

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"
 #include "base/file_path.h"
 #include "base/file_util_proxy.h"
 #include "base/memory/ref_counted.h"
 #include "base/platform_file.h"
 #include "base/tracked_objects.h"
 
 namespace base {
-class MessageLoopProxy;
+class SequencedTaskRunner;
 }
 
 namespace fileapi {
 
-using base::MessageLoopProxy;
 using base::PlatformFile;
 using base::PlatformFileError;
 using base::PlatformFileInfo;
 
 class FileSystemFileUtil;
 class FileSystemOperationContext;
 class FileSystemPath;
 
 // This class provides asynchronous access to FileSystemFileUtil methods for
 // FileSystem API operations.  This also implements cross-FileUtil copy/move
 // operations on top of FileSystemFileUtil methods.
 class FileSystemFileUtilProxy {
  public:
   // Some of the proxy routines are just wrapping around the FileUtilProxy's
   // relay methods, so we use the same types as FileUtilProxy for them.
   typedef base::FileUtilProxy::Entry Entry;
   typedef base::FileUtilProxy::CreateOrOpenCallback CreateOrOpenCallback;
 
   typedef base::Callback<void(PlatformFileError status)> StatusCallback;
   typedef base::Callback<void(PlatformFileError status,
                               bool created)> EnsureFileExistsCallback;
   typedef base::Callback<void(PlatformFileError status,
                               const PlatformFileInfo& info,
                               const FilePath& platform_path)>
       GetFileInfoCallback;
   typedef base::Callback<void(PlatformFileError,
                               const std::vector<Entry>&,
                               bool has_more)> ReadDirectoryCallback;
 
-  // Deletes a file or a directory on the given |message_loop_proxy|.
+  // Deletes a file or a directory on the given |task_runner|.
   // It is an error to delete a non-empty directory with recursive=false.
   static bool Delete(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemPath& path,
       bool recursive,
       const StatusCallback& callback);
 
   // Creates or opens a file with the given flags by calling |file_util|'s
-  // CreateOrOpen method on the given |message_loop_proxy|.
+  // CreateOrOpen method on the given |task_runner|.
   static bool CreateOrOpen(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemPath& path,
       int file_flags,
       const CreateOrOpenCallback& callback);
 
   // Copies a file or a directory from |src_path| to |dest_path| by calling
-  // FileSystemFileUtil's following methods on the given |message_loop_proxy|.
+  // FileSystemFileUtil's following methods on the given |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 path is an existing file.
   // If source file exists but destination path is an existing directory.
   // If source is a parent of destination.
   // If source doesn't exist.
   // If source and dest are the same path in the same filesystem.
   static bool Copy(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* src_util,
       FileSystemFileUtil* dest_util,
       const FileSystemPath& src_path,
       const FileSystemPath& dest_path,
       const StatusCallback& callback);
 
   // Moves a file or a directory from |src_path| to |dest_path| by calling
-  // FileSystemFileUtil's following methods on the given |message_loop_proxy|.
+  // FileSystemFileUtil's following methods on the given |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(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* src_util,
       FileSystemFileUtil* dest_util,
       const FileSystemPath& src_path,
       const FileSystemPath& dest_path,
       const StatusCallback& callback);
 
   // Ensures that the given |path| exist by calling |file_util|'s
-  // EnsureFileExists method on the given |message_loop_proxy|.
+  // EnsureFileExists method on the given |task_runner|.
   static bool EnsureFileExists(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemPath& path,
       const EnsureFileExistsCallback& callback);
 
   // Creates directory at a given path by calling |file_util|'s
-  // CreateDirectory method on the given |message_loop_proxy|.
+  // CreateDirectory method on the given |task_runner|.
   static bool CreateDirectory(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemPath& path,
       bool exclusive,
       bool recursive,
       const StatusCallback& callback);
 
   // Retrieves the information about a file by calling |file_util|'s
-  // GetFileInfo method on the given |message_loop_proxy|.
+  // GetFileInfo method on the given |task_runner|.
   static bool GetFileInfo(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemPath& path,
       const GetFileInfoCallback& callback);
 
   // Reads the filenames in |path| by calling |file_util|'s
-  // ReadDirectory method on the given |message_loop_proxy|.
+  // ReadDirectory method on the given |task_runner|.
   // TODO: this should support returning entries in multiple chunks.
   static bool ReadDirectory(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemPath& path,
       const ReadDirectoryCallback& callback);
 
   // Touches a file by calling |file_util|'s Touch method
-  // on the given |message_loop_proxy|.
+  // on the given |task_runner|.
   static bool Touch(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemPath& path,
       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 |message_loop_proxy|.
+  // Truncate method on the given |task_runner|.
   static bool Truncate(
-      MessageLoopProxy* message_loop_proxy,
+      base::SequencedTaskRunner* task_runner,
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
       const FileSystemPath& path,
       int64 length,
       const StatusCallback& callback);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileSystemFileUtilProxy);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_PROXY_H_