mandoline filesystem: Reland "Save cookie data to the mojo:filesystem."

In addition to saving the cookies to the file system service (per the
previous patch), we also modify the filesystem service to take a
client. When the shell connection to the file system service is broken,
instead of quitting immediately, we broadcast a shutdown notification to
all of our clients, and wait for them to close the directory objects.

This solves the timing problems during shutdown.

BUG=493311
TBR=shess@chromium.org
R=jam@chromium.org,erikwright@chromium.org
First Review URL: https://codereview.chromium.org/1179413010

Review URL: https://codereview.chromium.org/1231493002

Cr-Commit-Position: refs/heads/master@{#338888}

1 files changed, 24 insertions, 0 deletions

diff --git a/mojo/services/network/network_service_delegate_observer.h b/mojo/services/network/network_service_delegate_observer.h
new file mode 100644
index 0000000..d205b67
--- /dev/null
+++ b/mojo/services/network/network_service_delegate_observer.h
@@ -0,0 +1,24 @@
+// Copyright 2015 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.
+
+#ifndef MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_OBSERVER_H_
+#define MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_OBSERVER_H_
+
+namespace mojo {
+
+// Observer of events on from the NetworkServiceDelegate.
+//
+// Observers should be registered on the main thread.
+class NetworkServiceDelegateObserver {
+ public:
+  ~NetworkServiceDelegateObserver() {}
+
+  // Broadcast right before we attempt to shutdown the IO worker thread. This
+  // is
+  virtual void OnIOWorkerThreadShutdown() = 0;
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_OBSERVER_H_