[Experimental] Supporting OOPIF printing

content/public/browser/print_subframe_details.h

Index: content/public/browser/print_subframe_details.h
diff --git a/content/public/browser/print_subframe_details.h b/content/public/browser/print_subframe_details.h
new file mode 100644
index 0000000000000000000000000000000000000000..613c45b75165725b75f9b955fe3cb03e157757de
--- /dev/null
+++ b/content/public/browser/print_subframe_details.h
@@ -0,0 +1,20 @@
+// Copyright 2017 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 CONTENT_PUBLIC_BROWSER_PRINT_SUBFRAME_DETAILS_H_
+#define CONTENT_PUBLIC_BROWSER_PRINT_SUBFRAME_DETAILS_H_
+
+namespace content {
+
+struct PrintSubframeDetails {
+  PrintSubframeDetails(int page_number, int id)
+      : page_num(page_number), subframe_id(id) {}
+
+  int page_num;
+  int subframe_id;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_PRINT_SUBFRAME_DETAILS_H_