overscroll: Show a shadow for the sliding window during nav gesture.

content/browser/web_contents/web_contents_view_aura.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/renderer_host/overscroll_controller_delegate.h"
 #include "content/common/content_export.h"
 #include "content/port/browser/render_view_host_delegate_view.h"
 #include "content/public/browser/web_contents_view.h"
 #include "ui/aura/client/drag_drop_delegate.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/compositor/layer_animation_observer.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class DropTargetEvent;
 }
 
 namespace content {
 class OverscrollNavigationOverlay;
+class ShadowWindow;
 class WebContentsViewDelegate;
 class WebContentsImpl;
 class WebDragDestDelegate;
 
 class CONTENT_EXPORT WebContentsViewAura
     : public WebContentsView,
       public RenderViewHostDelegateView,
       NON_EXPORTED_BASE(public OverscrollControllerDelegate),
       public ui::ImplicitAnimationObserver,
       public aura::WindowDelegate,
@@ skipping 125 matching lines @@
   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
 
   // Overridden from aura::client::DragDropDelegate:
   virtual void OnDragEntered(const ui::DropTargetEvent& event) OVERRIDE;
   virtual int OnDragUpdated(const ui::DropTargetEvent& event) OVERRIDE;
   virtual void OnDragExited() OVERRIDE;
   virtual int OnPerformDrop(const ui::DropTargetEvent& event) OVERRIDE;
 
   scoped_ptr<aura::Window> window_;
+
+  // The window that shows the screenshot of the history page during an
+  // overscroll navigation gesture.
   scoped_ptr<aura::Window> overscroll_window_;
 
   scoped_ptr<WindowObserver> window_observer_;
 
   // The WebContentsImpl whose contents we display.
   WebContentsImpl* web_contents_;
 
   scoped_ptr<WebContentsViewDelegate> delegate_;
 
   WebKit::WebDragOperationsMask current_drag_op_;
 
   scoped_ptr<WebDropData> current_drop_data_;
 
   WebDragDestDelegate* drag_dest_delegate_;
 
   // We keep track of the render view host we're dragging over.  If it changes
   // during a drag, we need to re-send the DragEnter message.  WARNING:
   // this pointer should never be dereferenced.  We only use it for comparing
   // pointers.
   void* current_rvh_for_drag_;
 
+  // The container for the content-window. The doc for ShadowWindow explains its
+  // lifetime and ownership.
+  ShadowWindow* content_container_;
+
   bool overscroll_change_brightness_;
 
   // The overscroll gesture currently in progress.
   OverscrollMode current_overscroll_gesture_;
 
   // This is the completed overscroll gesture. This is used for the animation
   // callback that happens in response to a completed overscroll gesture.
   OverscrollMode completed_overscroll_gesture_;
 
   // This manages the overlay window that shows the screenshot during a history
   // navigation triggered by the overscroll gesture.
   scoped_ptr<OverscrollNavigationOverlay> navigation_overlay_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_