Stick windows to sides of workspaces

ash/wm/dock/dock_observer.h

Index: ash/wm/dock/dock_observer.h
diff --git a/ash/wm/dock/dock_observer.h b/ash/wm/dock/dock_observer.h
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+++ b/ash/wm/dock/dock_observer.h
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+// Copyright (c) 2013 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_DOCK_DOCK_OBSERVER_H_
+#define UI_DOCK_DOCK_OBSERVER_H_
+
+namespace gfx {
+class Rect;
+}
+
+namespace ash {
+namespace internal {
+
+// Observers to the DockController are notified of significant events that
+// occur with the dock, such as the bounds or visibility changing.
+class DockObserver {
+ public:
+  // Called when the dock bounds or visibility are about to change.
+  virtual void OnDockBoundsChanging(const gfx::Rect& new_bounds) = 0;
+};
+
+}  // namespace internal
+}  // namespace dock
+
+#endif  // UI_DOCK_DOCK_OBSERVER_H_