Attach panel while dragging to bring it in front of other panels.

ash/wm/workspace/workspace_manager.h

 // 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 ASH_WM_WORKSPACE_WORKSPACE_MANAGER_H_
 #define ASH_WM_WORKSPACE_WORKSPACE_MANAGER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 25 matching lines @@
 class Layer;
 }
 
 namespace ash {
 namespace internal {
 
 class DesktopBackgroundFadeController;
 class ShelfLayoutManager;
 class WorkspaceCycler;
 class WorkspaceCyclerAnimator;
+class WorkspaceEventHandler;
 class WorkspaceLayoutManager;
 class WorkspaceManagerTest2;
 class Workspace;
 
 // WorkspaceManager manages multiple workspaces in the desktop. Workspaces are
 // implicitly created as windows are maximized (or made fullscreen), and
 // destroyed when maximized windows are closed or restored. There is always one
 // workspace for the desktop.
 // Internally WorkspaceManager creates a Window for each Workspace. As windows
 // are maximized and restored they are reparented to the right Window.
@@ skipping 16 matching lines @@
 
   void SetShelf(ShelfLayoutManager* shelf);
 
   // Activates the workspace containing |window|. Does nothing if |window| is
   // NULL or not contained in a workspace.
   void SetActiveWorkspaceByWindow(aura::Window* window);
 
   // Returns the container window for the active workspace, never NULL.
   aura::Window* GetActiveWorkspaceWindow();
 
+  WorkspaceEventHandler* GetEventHandlerForWindow(aura::Window* window);
+
   // Returns the parent for |window|. This is invoked from StackingController
   // when a new Window is being added.
   aura::Window* GetParentForNewWindow(aura::Window* window);
 
   // Returns true if the user can start cycling through workspaces.
   bool CanStartCyclingThroughWorkspaces() const;
 
   // Initializes |animator| with the workspace manager's current state on
   // behalf of the workspace cycler.
   // This state should be cleared by the workspace cycler when
@@ skipping 184 matching lines @@
   // finger vertical scroll.
   scoped_ptr<WorkspaceCycler> workspace_cycler_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_MANAGER_H_