Redirect all mouse input to Alt+Tab window when it's visible,

ash/common/wm/window_cycle_list.cc

 // 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.
 
 #include "ash/common/wm/window_cycle_list.h"
 
 #include <list>
 #include <map>
 
 #include "ash/common/ash_switches.h"
@@ skipping 370 matching lines @@
       // never change).
       mirror_container_->layer()->SetAnimator(
           ui::LayerAnimator::CreateImplicitAnimator());
       // The selection highlight also animates all bounds changes and never
       // changes other animatable properties.
       highlight_view_->layer()->SetAnimator(
           ui::LayerAnimator::CreateImplicitAnimator());
     }
   }
 
+  void OnMouseCaptureLost() override {
+    WmShell::Get()->window_cycle_controller()->StopCycling();
+  }
+
   View* GetContentsView() override { return this; }
 
   View* GetInitiallyFocusedView() override {
     return window_view_map_[target_window_];
   }
 
   WmWindow* target_window() { return target_window_; }
 
  private:
   WindowCycleController::Direction initial_direction_;
@@ skipping 187 matching lines @@
       widget, kShellWindowId_OverlayContainer, &params);
   widget->Init(params);
 
   // TODO(estade): If the display metrics change, cancel the UI.
   gfx::Rect widget_rect = root_window->GetDisplayNearestWindow().bounds();
   int widget_height = cycle_view_->GetPreferredSize().height();
   widget_rect.set_y((widget_rect.height() - widget_height) / 2);
   widget_rect.set_height(widget_height);
   widget->SetBounds(widget_rect);
   widget->Show();
+  widget->SetCapture(cycle_view_);
+  widget->set_auto_release_capture(false);
   cycle_ui_widget_.reset(widget);
 }
 
 }  // namespace ash