Refactors maximize mode event handling into its own class

ash/aura/wm_shell_aura.cc

 // Copyright 2016 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.
 
 #include "ash/aura/wm_shell_aura.h"
 
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/overview/window_selector_controller.h"
 #include "ash/common/wm_activation_observer.h"
 #include "ash/common/wm_display_observer.h"
 #include "ash/common/wm_shell_common.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/wm/drag_window_resizer.h"
+#include "ash/wm/maximize_mode/maximize_mode_event_handler_aura.h"
 #include "ash/wm/screen_pinning_controller.h"
 #include "ash/wm/window_util.h"
 #include "base/memory/ptr_util.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/wm/public/activation_client.h"
 
 #if defined(OS_CHROMEOS)
 #include "ash/virtual_keyboard_controller.h"
 #endif
 
@@ skipping 91 matching lines @@
   return Shell::GetInstance()->metrics()->RecordUserMetricsAction(action);
 }
 
 std::unique_ptr<WindowResizer> WmShellAura::CreateDragWindowResizer(
     std::unique_ptr<WindowResizer> next_window_resizer,
     wm::WindowState* window_state) {
   return base::WrapUnique(
       DragWindowResizer::Create(next_window_resizer.release(), window_state));
 }
 
+std::unique_ptr<wm::MaximizeModeEventHandler>
+WmShellAura::CreateMaximizeModeEventHandler() {
+  return base::WrapUnique(new wm::MaximizeModeEventHandlerAura);
+}
+
 void WmShellAura::OnOverviewModeStarting() {
   FOR_EACH_OBSERVER(ShellObserver, *wm_shell_common_->shell_observers(),
                     OnOverviewModeStarting());
 }
 
 void WmShellAura::OnOverviewModeEnded() {
   FOR_EACH_OBSERVER(ShellObserver, *wm_shell_common_->shell_observers(),
                     OnOverviewModeEnded());
 }
 
@@ skipping 74 matching lines @@
   FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
                     OnDisplayConfigurationChanging());
 }
 
 void WmShellAura::OnDisplayConfigurationChanged() {
   FOR_EACH_OBSERVER(WmDisplayObserver, display_observers_,
                     OnDisplayConfigurationChanged());
 }
 
 }  // namespace ash