Convert app banners to use Mojo.

third_party/WebKit/public/platform/modules/app_banner/app_banner.mojom

Index: third_party/WebKit/public/platform/modules/app_banner/app_banner.mojom
diff --git a/third_party/WebKit/public/platform/modules/app_banner/app_banner.mojom b/third_party/WebKit/public/platform/modules/app_banner/app_banner.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..8a7c49c606d692c2b4e7b08c70ffd75da6a51b87
--- /dev/null
+++ b/third_party/WebKit/public/platform/modules/app_banner/app_banner.mojom
@@ -0,0 +1,28 @@
+// 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;
+
+enum AppBannerPromptReply {
+  NONE,
+  CANCEL,
+};
+
+interface AppBannerClient {
+  // The browser asks the renderer if the app banner should be shown.
+  BannerPromptRequest(AppBannerService service, AppBannerEvent& event,
+                      string platform) =>
+      (AppBannerPromptReply reply, string referrer);
+};
+
+interface AppBannerEvent {
+  // The browser informs Blink that the app banner was accepted/dismissed.
+  BannerAccepted(string platform);
+  BannerDismissed();
+};
+
+interface AppBannerService {
+  // Blink asks the browser to display a previously offered app banner.
+  DisplayAppBanner();
+};