Add an external protocol dialog for ARC

chrome/browser/chromeos/arc/arc_external_protocol_dialog.h

Index: chrome/browser/chromeos/arc/arc_external_protocol_dialog.h
diff --git a/chrome/browser/chromeos/arc/arc_external_protocol_dialog.h b/chrome/browser/chromeos/arc/arc_external_protocol_dialog.h
new file mode 100644
index 0000000000000000000000000000000000000000..e2134903e774c03102dbe9c9bb05bfe16f60e7b3
--- /dev/null
+++ b/chrome/browser/chromeos/arc/arc_external_protocol_dialog.h
@@ -0,0 +1,24 @@
+// Copyright 2016 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_ARC_ARC_EXTERNAL_PROTOCOL_DIALOG_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_ARC_EXTERNAL_PROTOCOL_DIALOG_H_
+
+#include "ui/base/page_transition_types.h"
+
+class GURL;
+
+namespace arc {
+
+// Shows ARC version of the dialog. Returns true if ARC is supported, running,
+// and in a context where it is allowed to handle external protocol.
+bool RunArcExternalProtocolDialog(const GURL& url,
+                                  int render_process_host_id,
+                                  int routing_id,
+                                  ui::PageTransition page_transition,
+                                  bool has_user_gesture);
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_EXTERNAL_PROTOCOL_DIALOG_H_