gdata: Convert FindEntryByResourceIdSync() to asynchronous.

chrome/browser/chromeos/gdata/gdata_files.cc

 // 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.
 
 #include "chrome/browser/chromeos/gdata/gdata_files.h"
 
 #include "base/utf_string_conversions.h"
 #include "base/platform_file.h"
 #include "base/stringprintf.h"
 #include "base/string_util.h"
 #include "chrome/browser/chromeos/gdata/gdata.pb.h"
 #include "chrome/browser/chromeos/gdata/gdata_parser.h"
 #include "chrome/browser/chromeos/gdata/gdata_util.h"
 #include "net/base/escape.h"
 
 namespace gdata {
 namespace {
 
 const char kSlash[] = "/";
 const char kEscapedSlash[] = "\xE2\x88\x95";
 
 // Extracts resource_id out of edit url.
 std::string ExtractResourceId(const GURL& url) {
   return net::UnescapeURLComponent(url.ExtractFileName(),
                                    net::UnescapeRule::URL_SPECIAL_CHARS);
 }
 
 }  // namespace
 
+void ReadOnlyFindEntryCallback(GDataEntry** out,
+                               base::PlatformFileError error,
+                               GDataEntry* entry) {
+  if (error == base::PLATFORM_FILE_OK)
+    *out = entry;
+}
+
 // GDataEntry class.
 
 GDataEntry::GDataEntry(GDataDirectory* parent, GDataRootDirectory* root)
     : root_(root),
       deleted_(false) {
   SetParent(parent);
 }
 
 GDataEntry::~GDataEntry() {
 }
@@ skipping 732 matching lines @@
       return false;
     }
 
     FromProto(proto);
     set_origin(FROM_CACHE);
   }
   return ok;
 }
 
 }  // namespace gdata