gdata: Convert FindEntryByResourceIdSync() to asynchronous.

chrome/browser/chromeos/gdata/gdata_files.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 CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILES_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILES_H_
 #pragma once
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/memory/weak_ptr.h"
 #include "base/platform_file.h"
 #include "base/synchronization/lock.h"
-#include "chrome/browser/chromeos/gdata/find_entry_callback.h"
 #include "chrome/browser/chromeos/gdata/gdata_params.h"
 #include "chrome/browser/chromeos/gdata/gdata_parser.h"
 #include "chrome/browser/chromeos/gdata/gdata_uploader.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
 namespace gdata {
 
+class GDataEntry;
 class GDataFile;
 class GDataDirectory;
 class GDataRootDirectory;
 
 class GDataEntryProto;
 class GDataFileProto;
 class GDataDirectoryProto;
 class GDataRootDirectoryProto;
 class PlatformFileInfoProto;
 
@@ skipping 18 matching lines @@
 };
 
 // The root directory name used for the Google Drive file system tree. The
 // name is used in URLs for the file manager, hence user-visible.
 const FilePath::CharType kGDataRootDirectory[] = FILE_PATH_LITERAL("drive");
 
 // The resource ID for the root directory is defined in the spec:
 // https://developers.google.com/google-apps/documents-list/
 const char kGDataRootDirectoryResourceId[] = "folder:root";
 
+// Used to get result of file search.
+// If |error| is not PLATFORM_FILE_OK, |entry| is set to NULL.
+typedef base::Callback<void(base::PlatformFileError error, GDataEntry* entry)>
+    FindEntryCallback;
+
 // Base class for representing files and directories in gdata virtual file
 // system.
 class GDataEntry {
  public:
   explicit GDataEntry(GDataDirectory* parent, GDataRootDirectory* root);
   virtual ~GDataEntry();
 
   virtual GDataFile* AsGDataFile();
   virtual GDataDirectory* AsGDataDirectory();
   virtual GDataRootDirectory* AsGDataRootDirectory();
@@ skipping 347 matching lines @@
   base::Time last_serialized_;
   int largest_changestamp_;
   size_t serialized_size_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataRootDirectory);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILES_H_