Refactors maximize mode event handling into its own class

ash/wm/maximize_mode/maximize_mode_window_manager.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 ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_MANAGER_H_
 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <set>
 
 #include "ash/ash_export.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/wm/window_state.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/aura/window_observer.h"
 #include "ui/display/display_observer.h"
-#include "ui/events/event_handler.h"
-
-namespace ui {
-class TouchEvent;
-}
 
 namespace ash {
 class MaximizeModeController;
 class MaximizeModeWindowState;
 class WmWindow;
 
+namespace wm {
+class MaximizeModeEventHandler;
+}
+
 // A window manager which - when created - will force all windows into maximized
 // mode. Exception are panels and windows which cannot be maximized.
 // Windows which cannot be maximized / resized are centered with a layer placed
 // behind the window so that no other windows are visible and/or obscured.
 // With the destruction of the manager all windows will be restored to their
 // original state.
 class ASH_EXPORT MaximizeModeWindowManager : public aura::WindowObserver,
                                              public display::DisplayObserver,
-                                             public ShellObserver,
-                                             public ui::EventHandler {
+                                             public ShellObserver {
  public:
   // This should only be deleted by the creator (ash::Shell).
   ~MaximizeModeWindowManager() override;
 
   // Returns the number of maximized & tracked windows by this manager.
   int GetNumberOfManagedWindows();
 
   // Adds a window which needs to be maximized. This is used by other window
   // managers for windows which needs to get tracked due to (upcoming) state
   // changes.
@@ skipping 16 matching lines @@
   void OnWindowBoundsChanged(aura::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
 
   // display::DisplayObserver overrides:
   void OnDisplayAdded(const display::Display& display) override;
   void OnDisplayRemoved(const display::Display& display) override;
   void OnDisplayMetricsChanged(const display::Display& display,
                                uint32_t metrics) override;
 
-  // ui::EventHandler override:
-  void OnTouchEvent(ui::TouchEvent* event) override;
-
  protected:
   friend class MaximizeModeController;
 
   // The object should only be created by the ash::Shell.
   MaximizeModeWindowManager();
 
  private:
   typedef std::map<aura::Window*, MaximizeModeWindowState*> WindowToState;
 
   // Maximize all windows and restore their current state.
@@ skipping 37 matching lines @@
 
   // Every window which got touched by our window manager gets added here.
   WindowToState window_state_map_;
 
   // All container windows which have to be tracked.
   std::set<aura::Window*> observed_container_windows_;
 
   // True if all backdrops are hidden.
   bool backdrops_hidden_;
 
+  std::unique_ptr<wm::MaximizeModeEventHandler> event_handler_;
+
   DISALLOW_COPY_AND_ASSIGN(MaximizeModeWindowManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_MANAGER_H_