Support file system access in DevTools with isolated file system.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index eaa2156bd40a7a610c0eba95cc480c857288b6d0..0bb8a77abefce682e6a11a5e597f9c5a04410590 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1645,6 +1645,9 @@ const char kDevToolsDockSide[] = "devtools.dock_side";
 // Maps of files edited locally using DevTools.
 const char kDevToolsEditedFiles[] = "devtools.edited_files";
 
+// List of file system paths added in DevTools.
+const char kDevToolsFileSystemPaths[] = "devtools.file_system_paths";
+
 // Integer location of the horizontal split bar in the browser view.
 const char kDevToolsHSplitLocation[] = "devtools.split_location";