arc: Add URL converter functions

chrome/browser/chromeos/fileapi/external_file_url_util.cc

 // Copyright 2014 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/fileapi/external_file_url_util.h"
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string_util.h"
@@ skipping 19 matching lines @@
          type == storage::kFileSystemTypeProvided;
 }
 
 GURL FileSystemURLToExternalFileURL(
     const storage::FileSystemURL& file_system_url) {
   if (file_system_url.mount_type() != storage::kFileSystemTypeExternal ||
       !IsExternalFileURLType(file_system_url.type())) {
     return GURL();
   }
 
-  return GURL(base::StringPrintf(
-      "%s:%s",
-      content::kExternalFileScheme,
-      file_system_url.virtual_path().AsUTF8Unsafe().c_str()));
+  return VirtualPathToExternalFileURL(file_system_url.virtual_path());
 }
 
 base::FilePath ExternalFileURLToVirtualPath(const GURL& url) {
   if (!url.is_valid() || url.scheme() != content::kExternalFileScheme)
     return base::FilePath();
   const std::string path_string =
       net::UnescapeURLComponent(url.GetContent(), net::UnescapeRule::NORMAL);
   return base::FilePath::FromUTF8Unsafe(path_string);
 }
 
+GURL VirtualPathToExternalFileURL(const base::FilePath& virtual_path) {
+  return GURL(base::StringPrintf("%s:%s", content::kExternalFileScheme,
+                                 virtual_path.AsUTF8Unsafe().c_str()));
+}
+
 GURL CreateExternalFileURLFromPath(Profile* profile,
                                    const base::FilePath& path) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   GURL raw_file_system_url;
   if (!file_manager::util::ConvertAbsoluteFilePathToFileSystemUrl(
           profile,
           path,
           file_manager::kFileManagerAppId,
           &raw_file_system_url)) {
     return GURL();
   }
 
   const storage::FileSystemURL file_system_url =
       file_manager::util::GetFileSystemContextForExtensionId(
           profile, file_manager::kFileManagerAppId)
           ->CrackURL(raw_file_system_url);
   if (!file_system_url.is_valid())
     return GURL();
 
   return FileSystemURLToExternalFileURL(file_system_url);
 }
 
 }  // namespace chromeos