Add support for persistent file access in apps.

chrome/renderer/extensions/file_system_natives.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/renderer/extensions/file_system_natives.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 10 matching lines @@
 
 namespace extensions {
 
 FileSystemNatives::FileSystemNatives(v8::Handle<v8::Context> context)
     : ObjectBackedNativeHandler(context) {
   RouteFunction("GetFileEntry",
       base::Bind(&FileSystemNatives::GetFileEntry, base::Unretained(this)));
   RouteFunction("GetIsolatedFileSystem",
       base::Bind(&FileSystemNatives::GetIsolatedFileSystem,
                  base::Unretained(this)));
+  RouteFunction("CrackIsolatedFileSystemName",
+      base::Bind(&FileSystemNatives::CrackIsolatedFileSystemName,
+                 base::Unretained(this)));
 }
 
 v8::Handle<v8::Value> FileSystemNatives::GetIsolatedFileSystem(
     const v8::Arguments& args) {
   DCHECK(args.Length() == 1 || args.Length() == 2);
   DCHECK(args[0]->IsString());
   std::string file_system_id(*v8::String::Utf8Value(args[0]));
   WebKit::WebFrame* webframe = WebKit::WebFrame::frameForContext(v8_context());
   DCHECK(webframe);
 
@@ skipping 50 matching lines @@
   WebKit::WebFrame* webframe = WebKit::WebFrame::frameForContext(v8_context());
   DCHECK(webframe);
   return webframe->createFileEntry(
       type,
       WebKit::WebString::fromUTF8(file_system_name),
       WebKit::WebString::fromUTF8(file_system_root_url),
       WebKit::WebString::fromUTF8(file_path_string),
       is_directory);
 }
 
+v8::Handle<v8::Value> FileSystemNatives::CrackIsolatedFileSystemName(
+    const v8::Arguments& args) {
+  DCHECK_EQ(args.Length(), 1);
+  DCHECK(args[0]->IsString());
+  std::string filesystem_name = *v8::String::Utf8Value(args[0]->ToString());
+  std::string filesystem_id;
+  if (!fileapi::CrackIsolatedFileSystemName(filesystem_name, &filesystem_id))
+    return v8::Undefined();
+
+  return v8::String::New(filesystem_id.c_str(), filesystem_id.size());
+}
+
 }  // namespace extensions