Remove stops_event_propagation from Window, since it's broken.

Changes it to be implemented by the Aura client, via a new interface EventClient.
The client can determine whether or not a given window and its subtree can receive events.
I also cleaned up the way screen locking is entered/exited via the delegate, and some stuff in ash/shell.

http://crbug.com/119347
TEST=none
Review URL: https://chromiumcodereview.appspot.com/9788001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@128553 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 36 insertions, 0 deletions

diff --git a/ui/aura/client/event_client.h b/ui/aura/client/event_client.h
new file mode 100644
index 0000000..caf3a2b
--- /dev/null
+++ b/ui/aura/client/event_client.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2012 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 UI_AURA_CLIENT_EVENT_CLIENT_H_
+#define UI_AURA_CLIENT_EVENT_CLIENT_H_
+#pragma once
+
+#include "ui/aura/aura_export.h"
+#include "ui/aura/window.h"
+
+namespace aura {
+
+class Event;
+class RootWindow;
+
+namespace client {
+
+// An interface implemented by an object that alters event processing.
+class AURA_EXPORT EventClient {
+ public:
+  // Returns true if events can be processed by |window| or any of its children.
+  virtual bool CanProcessEventsWithinSubtree(const Window* window) const = 0;
+
+ protected:
+  virtual ~EventClient() {}
+};
+
+// Sets/Gets the event client on the RootWindow.
+AURA_EXPORT void SetEventClient(RootWindow* root_window, EventClient* client);
+AURA_EXPORT EventClient* GetEventClient(const RootWindow* root_window);
+
+}  // namespace clients
+}  // namespace aura
+
+#endif  // UI_AURA_CLIENT_EVENT_CLIENT_H_