make media gallery directory tooltips in media gallery config dialog absolute paths

chrome/browser/media_gallery/media_galleries_preferences.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/media_gallery/media_galleries_preferences.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
@@ skipping 106 matching lines @@
   return dict;
 }
 
 }  // namespace
 
 MediaGalleryPrefInfo::MediaGalleryPrefInfo()
     : pref_id(kInvalidMediaGalleryPrefId) {
 }
 MediaGalleryPrefInfo::~MediaGalleryPrefInfo() {}
 
+FilePath MediaGalleryPrefInfo::AbsolutePath() const {
+  FilePath base_path = MediaStorageUtil::FindDevicePathById(device_id);
+  return base_path.Append(path);
+}
+
 MediaGalleriesPreferences::MediaGalleriesPreferences(Profile* profile)
     : profile_(profile) {
   // Populate the default galleries if this is a fresh profile.
   MediaGalleryPrefId current_id =
       profile_->GetPrefs()->GetUint64(prefs::kMediaGalleriesUniqueId);
   if (current_id == kInvalidMediaGalleryPrefId + 1) {
     FilePath pictures_path;
     if (PathService::Get(chrome::DIR_USER_PICTURES, &pictures_path)) {
       std::string device_id;
       string16 display_name;
@@ skipping 251 matching lines @@
 }
 
 extensions::ExtensionPrefs*
 MediaGalleriesPreferences::GetExtensionPrefs() const {
   ExtensionService* extension_service =
       extensions::ExtensionSystem::Get(profile_)->extension_service();
   return extension_service->extension_prefs();
 }
 
 } // namespace chrome