Convert SetContentSettingRules to use mojo, part 1/2.

components/content_settings/core/common/content_settings.mojom

+// 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.
+
+module content_settings.mojom;
+
+// This mirrors the C++ type in content_settings_pattern.h.
+struct PatternParts {
+  string scheme;

[Tom Sepez, 2017/01/03 19:16:02]

Are there any assumptions on the receiving end about what characters may appear
in these strings? do we need to sanitize them when reading via traits?

[nigeltao1, 2017/01/04 23:53:38]

I've copy/pasted the comments from the C++ PatternParts type at
https://cs.chromium.org/chromium/src/components/content_settings/core/common/...

+  bool is_scheme_wildcard;
+  string host;
+  bool has_domain_wildcard;

[Tom Sepez, 2017/01/03 19:16:02]

nit: has_host_wildcard?

[nigeltao1, 2017/01/04 23:53:38]

As per those copy/pasted comments, the host might not be a domain, such as an IP
address.

+  string port;
+  bool is_port_wildcard;
+  string path;
+  bool is_path_wildcard;
+};
+
+// This mirrors the C++ type in content_settings_pattern.h.
+struct ContentSettingsPattern {
+  PatternParts parts;
+  bool is_valid;
+};
+
+// This mirrors the C++ type in content_settings.h.
+enum ContentSetting {
+  DEFAULT = 0,
+  ALLOW,
+  BLOCK,
+  ASK,
+  SESSION_ONLY,
+  DETECT_IMPORTANT_CONTENT
+};
+
+// This mirrors the C++ type in content_settings.h.
+struct ContentSettingPatternSource {
+  ContentSettingsPattern primary_pattern;
+  ContentSettingsPattern secondary_pattern;
+  ContentSetting setting;
+  string source;
+  bool incognito;
+};
+
+// This mirrors the C++ type in content_settings.h.
+struct RendererContentSettingRules {
+  array<ContentSettingPatternSource> image_rules;
+  array<ContentSettingPatternSource> script_rules;
+  array<ContentSettingPatternSource> autoplay_rules;
+};