exo: Drop window on touch release

components/exo/shell_surface.h

 // Copyright 2015 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 COMPONENTS_EXO_SHELL_SURFACE_H_
 #define COMPONENTS_EXO_SHELL_SURFACE_H_
 
 #include <cstdint>
 #include <deque>
 #include <memory>
@@ skipping 253 matching lines @@
   void OnWindowActivated(
       aura::Window* gained_active,
       aura::Window* lost_active) override;
 
   // Overridden from WMHelper::DisplayConfigurationObserver:
   void OnDisplayConfigurationChanged() override;
 
   // Overridden from ui::EventHandler:
   void OnKeyEvent(ui::KeyEvent* event) override;
   void OnMouseEvent(ui::MouseEvent* event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
 
   // Overridden from ui::AcceleratorTarget:
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
 
   aura::Window* shadow_overlay() { return shadow_overlay_.get(); }
   aura::Window* shadow_underlay() { return shadow_underlay_.get(); }
 
   Surface* surface_for_testing() { return root_surface(); }
 
  private:
@@ skipping 92 matching lines @@
   bool pending_shadow_underlay_in_surface_ = true;
   bool system_modal_ = false;
   gfx::ImageSkia icon_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellSurface);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_SHELL_SURFACE_H_