CrOS - Make it possible to Alt+Tab while dragging a tab

ash/wm/window_cycle_event_filter_aura.h

Index: ash/wm/window_cycle_event_filter_aura.h
diff --git a/ash/wm/window_cycle_event_filter_aura.h b/ash/wm/window_cycle_event_filter_aura.h
index d3a8e44c660ee1646f32b30b98ab2275b87ccb11..eb567f62b7a7f1415d6a2214e9e7e73e0c6639fe 100644
--- a/ash/wm/window_cycle_event_filter_aura.h
+++ b/ash/wm/window_cycle_event_filter_aura.h
@@ -20,14 +20,28 @@ class WindowCycleEventFilterAura : public ui::EventHandler,
 
   // Overridden from ui::EventHandler:
   void OnKeyEvent(ui::KeyEvent* event) override;
+  void OnMouseEvent(ui::MouseEvent* event) override;
 
  private:
+  class AltReleaseHandler : public ui::EventHandler {
+   public:
+    AltReleaseHandler();
+    ~AltReleaseHandler() override;
+
+    void OnKeyEvent(ui::KeyEvent* event) override;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(AltReleaseHandler);
+  };
+
   // When the user holds Alt+Tab, this timer is used to send repeated
   // cycle commands to WindowCycleController. Note this is not accomplished
   // by marking the Alt+Tab accelerator as "repeatable" in the accelerator
   // table because we wish to control the repeat interval.
   base::RepeatingTimer repeat_timer_;
 
+  AltReleaseHandler alt_release_handler_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowCycleEventFilterAura);
 };