Migrated ChromeViewHostMsg_PageHasOSDD to Mojo.

chrome/common/osdd_handler.mojom

+// 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.
+
+module chrome.mojom;
+
+import "url/mojo/url.mojom";
+
+interface OSDDHandler {
+  // Notification that the page has an OpenSearch description document
+  // associated with it.
+  OnPageHasOSDD(url.mojom.Url page_url, url.mojom.Url osdd_url);

[Sam McNally, 2017/03/15 00:38:48]

We usually don't include "On" in mojo method names except for observer
interfaces.

I would also spell out OpenSearchDescriptionDocument instead of OSDD.

[martis, 2017/03/15 05:00:56]

Done.

+};