Pass ServiceProvider thru ViewManagerService::Embed() allowing embedder & embeddee to expose servic…

mojo/public/cpp/application/lib/weak_service_provider.cc

+// Copyright 2014 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 "mojo/public/cpp/application/lib/weak_service_provider.h"
+#include "mojo/public/interfaces/application/service_provider.mojom.h"
+
+namespace mojo {
+namespace internal {
+
+WeakServiceProvider::WeakServiceProvider(ServiceProvider* service_provider)
+      : service_provider_(service_provider) {}
+
+WeakServiceProvider::~WeakServiceProvider() {}
+
+void WeakServiceProvider::Clear() {
+  service_provider_ = NULL;
+}
+
+void WeakServiceProvider::ConnectToService(
+    const String& service_name,
+    ScopedMessagePipeHandle client_handle) {
+  if (service_provider_)
+    service_provider_->ConnectToService(service_name, client_handle.Pass());
+}
+
+}  // namespace internal
+}  // namespace mojo