Fetch Mandoline components from Google Storage as needed.

mojo/fetcher/local_fetcher.h

Index: mojo/fetcher/local_fetcher.h
diff --git a/mojo/fetcher/local_fetcher.h b/mojo/fetcher/local_fetcher.h
index 7adb9b4c93db6e8ccb2631387c8ca8fa91cd0ba9..a09fdc90549a89f3d388215a5c0e235e70befccd 100644
--- a/mojo/fetcher/local_fetcher.h
+++ b/mojo/fetcher/local_fetcher.h
@@ -23,8 +23,11 @@ class LocalFetcher : public shell::Fetcher {
   LocalFetcher(NetworkService* network_service,
                const GURL& url,
                const GURL& url_without_query,
+               const base::FilePath& shell_file_root,
                const FetchCallback& loader_callback);
 
+  ~LocalFetcher() override;
+
   void GetMimeTypeFromFileCallback(const mojo::String& mime_type);
 
  private:
@@ -47,6 +50,7 @@ class LocalFetcher : public shell::Fetcher {
 
   GURL url_;
   base::FilePath path_;
+  base::FilePath shell_file_root_;
   std::string mime_type_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalFetcher);