Convert app banners to use Mojo.

components/test_runner/app_banner_service.cc

+// 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.
+
+#include "components/test_runner/app_banner_service.h"
+
+namespace test_runner {
+
+AppBannerService::AppBannerService() : binding_(this) {}
+
+AppBannerService::~AppBannerService() {}
+
+mojo::ScopedMessagePipeHandle AppBannerService::GetEventHandle() {
+  return mojo::GetProxy(&event_).PassMessagePipe();
+}
+
+mojo::ScopedMessagePipeHandle AppBannerService::GetServiceHandle() {
+  return binding_.CreateInterfacePtrAndBind().PassInterface().PassHandle();
+}
+
+void AppBannerService::ResolvePromise(const std::string& platform) {
+  if (!event_.is_bound())
+    return;
+
+  // Empty platform means to resolve as a dismissal.
+  if (platform.empty())
+    event_->BannerDismissed();
+  else
+    event_->BannerAccepted(platform);
+}
+
+void AppBannerService::DisplayAppBanner() { /* do nothing */ }
+
+}  // namespace test_runner