Use last_selected_directory() when invalid path is passed to CrOS file picker.

chrome/browser/ui/views/select_file_dialog_extension.cc

Index: chrome/browser/ui/views/select_file_dialog_extension.cc
diff --git a/chrome/browser/ui/views/select_file_dialog_extension.cc b/chrome/browser/ui/views/select_file_dialog_extension.cc
index 0b7bb25bbf7d99878e61295816c3e367fa58af8e..0d283dc747a16c1c7c2f48a6c28c3242f2d85922 100644
--- a/chrome/browser/ui/views/select_file_dialog_extension.cc
+++ b/chrome/browser/ui/views/select_file_dialog_extension.cc
@@ -321,10 +321,20 @@ void SelectFileDialogExtension::SelectFileImpl(
   }
 
   base::FilePath virtual_path;
-  if (file_manager_util::ConvertFileToRelativeFileSystemPath(
-          profile_, kFileBrowserDomain, default_dialog_path, &virtual_path)) {
+  // If an absolute path is specified as the default path, convert it to the
+  // virtual path in the file browser extension. Due to the current design,
+  // an invalid temporal cache file path may passed as |default_dialog_path|
+  // (crbug.com/178013 #9-#11). In such a case, we use the last selected
+  // directory as a workaround. Real fix is tracked at crbug.com/110119.
+  if (default_dialog_path.IsAbsolute() &&
+      (file_manager_util::ConvertFileToRelativeFileSystemPath(
+           profile_, kFileBrowserDomain, default_dialog_path, &virtual_path) ||
+       file_manager_util::ConvertFileToRelativeFileSystemPath(
+           profile_, kFileBrowserDomain, profile_->last_selected_directory(),
+           &virtual_path))) {
     virtual_path = base::FilePath("/").Append(virtual_path);
   } else {
+    // If the path was relative, or failed to convert, just use the base name,
     virtual_path = default_dialog_path.BaseName();
   }