Convert ManifestManager IPCs to Mojo.

third_party/WebKit/public/platform/modules/manifest/manifest.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 blink.mojom;
+
+import "third_party/WebKit/public/platform/display_mode.mojom";
+import "third_party/WebKit/public/platform/modules/screen_orientation/screen_orientation.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
+import "url/mojo/url.mojom";
+
+struct ManifestIcon {
+  url.mojom.Url src;
+  string? type;
+  array<gfx.mojom.Size> sizes;
+};
+
+struct RelatedApplication {
+  string? platform;
+  url.mojom.Url url;
+  string? id;
+};
+
+struct Manifest {
+  string? name;
+  string? short_name;
+  url.mojom.Url? start_url;
+  DisplayMode display;
+  ScreenOrientationLockType orientation;
+  array<ManifestIcon>? icons;
+  array<RelatedApplication>? related_applications;
+  bool prefer_related_applications;
+  int64 theme_color;
+  int64 background_color;
+  string? gcm_sender_id;
+};