Enable Mojo to download from file URLs

mojo/shell/network_delegate.cc

Index: mojo/shell/network_delegate.cc
diff --git a/mojo/shell/network_delegate.cc b/mojo/shell/network_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7359def0f2e57f2c49132925f1d1d0d5c11a397c
--- /dev/null
+++ b/mojo/shell/network_delegate.cc
@@ -0,0 +1,27 @@
+// Copyright (c) 2013 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 "mojo/shell/network_delegate.h"
+
+#include "base/command_line.h"
+#include "mojo/shell/switches.h"
+#include "net/url_request/url_request.h"
+
+namespace mojo {
+namespace shell {
+
+NetworkDelegate::NetworkDelegate() {
+  DetachFromThread();
+}
+
+bool NetworkDelegate::OnCanAccessFile(const net::URLRequest& request,
+                                      const base::FilePath& path) const {
+  // TODO(aa): We might want to add a --allow-file-urls or something, but
+  // starting conservative.
+  return CommandLine::ForCurrentProcess()->GetSwitchValueASCII(switches::kApp)
+      == request.url().spec();
+}
+
+}  // namespace shell
+}  // namespace mojo