Add full support for filesystem URLs.

webkit/fileapi/file_system_path_manager.cc

Index: webkit/fileapi/file_system_path_manager.cc
diff --git a/webkit/fileapi/file_system_path_manager.cc b/webkit/fileapi/file_system_path_manager.cc
index 92681064e4b3c288cd0c6677a9a01086f1d7d539..2804437ead691d43a71620ec02f5c89f3f6cfd9c 100644
--- a/webkit/fileapi/file_system_path_manager.cc
+++ b/webkit/fileapi/file_system_path_manager.cc
@@ -100,11 +100,14 @@ FilePath FileSystemPathManager::ValidateFileSystemRootAndGetPathOnFileThread(
 }
 
 bool FileSystemPathManager::IsAllowedScheme(const GURL& url) const {
-  // Basically we only accept http or https. We allow file:// URLs
-  // only if --allow-file-access-from-files flag is given.
+  // Basically we only accept http, https, or extensions. We allow file:// URLs
+  // only if --allow-file-access-from-files flag is given.  And we allow
+  // filesystem: urls if the URL's inner scheme is one we allow.
   return url.SchemeIs("http") || url.SchemeIs("https") ||
          url.SchemeIs(kExtensionScheme) || url.SchemeIs(kChromeScheme) ||
-         (url.SchemeIsFile() && allow_file_access_from_files_);
+         (url.SchemeIsFile() && allow_file_access_from_files_) ||
+         (url.SchemeIsFileSystem() && url.inner_url() &&
+             IsAllowedScheme(*url.inner_url()));
 }
 
 // static