Change media galleries to external file system type to add toURL support

chrome/renderer/extensions/media_galleries_custom_bindings.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/media_galleries_custom_bindings.h"
 
 #include <string>
 
 #include "chrome/common/extensions/extension_constants.h"
 #include "third_party/WebKit/public/web/WebDOMFileSystem.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "v8/include/v8.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 namespace extensions {
 
 namespace {
 
 // FileSystemObject GetMediaFileSystem(string file_system_url): construct
 // a file system object from a file system url.
 void GetMediaFileSystemObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK_EQ(1, args.Length());
   CHECK(args[0]->IsString());
 
-  std::string fsid(*v8::String::Utf8Value(args[0]));
-  CHECK(!fsid.empty());
+  std::string fs_mount(*v8::String::Utf8Value(args[0]));
+  CHECK(!fs_mount.empty());
 
   blink::WebFrame* webframe = blink::WebFrame::frameForCurrentContext();
   const GURL origin = GURL(webframe->document().securityOrigin().toString());
-  const std::string fs_name = fileapi::GetIsolatedFileSystemName(origin, fsid);
+  std::string fs_name =
+      fileapi::GetFileSystemName(origin, fileapi::kFileSystemTypeExternal);
+  fs_name.append("_");
+  fs_name.append(fs_mount);
   const GURL root_url(
-      fileapi::GetIsolatedFileSystemRootURIString(
-          origin, fsid, extension_misc::kMediaFileSystemPathPart));
+      fileapi::GetExternalFileSystemRootURIString(origin, fs_mount));
   args.GetReturnValue().Set(
-      blink::WebDOMFileSystem::create(
-          webframe,
-          blink::WebFileSystemTypeIsolated,
-          blink::WebString::fromUTF8(fs_name),
-          root_url).toV8Value());
+      blink::WebDOMFileSystem::create(webframe,
+                                      blink::WebFileSystemTypeExternal,
+                                      blink::WebString::fromUTF8(fs_name),
+                                      root_url).toV8Value());
 }
 
 }  // namespace
 
 MediaGalleriesCustomBindings::MediaGalleriesCustomBindings(
     Dispatcher* dispatcher, ChromeV8Context* context)
     : ChromeV8Extension(dispatcher, context) {
   RouteFunction("GetMediaFileSystemObject",
                 base::Bind(&GetMediaFileSystemObject));
 }
 
 }  // namespace extensions