Add mojo data types for CopylessPaste

third_party/WebKit/public/platform/modules/document_metadata/copyless_paste.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 blink.mojom;
+
+union Values {

[dcheng, 2017/04/04 06:30:21]

Nit: please add some comments that document the different data types here and
what the fields mean/how they're used/how they're related/other relevant
info/etc, it's pretty opaque atm.

It looks like there's some sort of tree structure with
Entity.properties.values.entity_values, but it would be nice to document it.

[wychen, 2017/04/05 00:57:53]

Done.

+  array<bool> bool_values;
+  array<int64> long_values;
+  array<string> string_values;
+  array<Entity> entity_values;
+};
+
+struct Property {
+  string name;
+  Values values;
+};
+
+struct Entity {
+  string type;
+  array<Property> properties;
+};
+
+struct WebPage {
+  string url;

[dcheng, 2017/04/04 06:30:20]

Please use url.mojom.Url.

[wychen, 2017/04/05 00:57:53]

Done.

+  string title;
+  array<Entity> entities;
+};