Ensure that an activity is activated when overview mode is exited

athena/wm/window_overview_mode.h

 // 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.
 
 #ifndef ATHENA_WM_WINDOW_OVERVIEW_MODE_H_
 #define ATHENA_WM_WINDOW_OVERVIEW_MODE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/window.h"
 
 namespace athena {
 class SplitViewController;
 class WindowListProvider;
 
 class WindowOverviewModeDelegate {
  public:
+  enum SplitType {
+    SPLIT_NONE,
+    SPLIT_LEFT,
+    SPLIT_RIGHT
+  };
+
   virtual ~WindowOverviewModeDelegate() {}
 
-  virtual void OnSelectWindow(aura::Window* window) = 0;
-
-  // Gets into split-view mode with |left| on the left-side of the screen, and
-  // |right| on the right-side. If |left| or |right| is NULL, then the delegate
-  // selects the best option in its place.
-  virtual void OnSplitViewMode(aura::Window* left,
-                               aura::Window* right) = 0;
+  // Called when a window is selected in overview mode. |window| is the window
+  // to be activated. |split_type| indicates whether the window should be part
+  // of split view and what position it should have in split view. The method
+  // should update |window|'s bounds, opacity and visibility.
+  virtual void OnSelectWindow(aura::Window* window, SplitType split_type) = 0;
 };
 
 class WindowOverviewMode {
  public:
   virtual ~WindowOverviewMode() {}
 
   static scoped_ptr<WindowOverviewMode> Create(
       aura::Window* container,
       const WindowListProvider* window_list_provider,
       SplitViewController* split_view_controller,
       WindowOverviewModeDelegate* delegate);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_WM_WINDOW_OVERVIEW_MODE_H_