Create only a single LegacyRenderWidgetHostHWND per WebContentsViewAura.

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/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/web_contents/web_contents_view.h"
 #include "content/common/content_export.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_observer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/wm/public/drag_drop_delegate.h"
 
+#if defined(OS_WIN)
+#include "content/browser/renderer_host/legacy_render_widget_host_win.h"
+#endif
+
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class DropTargetEvent;
 }
 
 namespace content {
 class GestureNavSimple;
 class OverscrollNavigationOverlay;
 class RenderWidgetHostImpl;
 class RenderWidgetHostViewAura;
 class ShadowLayerDelegate;
 class TouchEditableImplAura;
 class WebContentsViewDelegate;
 class WebContentsImpl;
 class WebDragDestDelegate;
 
+#if defined(OS_WIN)
+class LegacyRenderWidgetHostHWND;
+#endif
+
 class WebContentsViewAura
     : public WebContentsView,
+#if defined(OS_WIN)
+      public LegacyRenderWidgetHostHWNDDelegate,
+#endif
       public RenderViewHostDelegateView,
       public OverscrollControllerDelegate,
       public ui::ImplicitAnimationObserver,
       public aura::WindowDelegate,
       public aura::client::DragDropDelegate,
       public aura::WindowObserver {
  public:
   WebContentsViewAura(WebContentsImpl* web_contents,
                       WebContentsViewDelegate* delegate);
 
@@ skipping 131 matching lines @@
   virtual void OnDragExited() override;
   virtual int OnPerformDrop(const ui::DropTargetEvent& event) override;
 
   // Overridden from aura::WindowObserver:
   virtual void OnWindowVisibilityChanged(aura::Window* window,
                                          bool visible) override;
 
   // Update the web contents visiblity.
   void UpdateWebContentsVisibility(bool visible);
 
+#if defined(OS_WIN)
+  // Overridden from LegacyRenderWidgetHostHWNDDelegate:
+  virtual gfx::NativeViewAccessible GetNativeViewAccessible() OVERRIDE;
+#endif
+
   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_;
@@ skipping 23 matching lines @@
 
   // This manages the overlay window that shows the screenshot during a history
   // navigation triggered by the overscroll gesture.
   scoped_ptr<OverscrollNavigationOverlay> navigation_overlay_;
 
   scoped_ptr<ShadowLayerDelegate> overscroll_shadow_;
 
   scoped_ptr<TouchEditableImplAura> touch_editable_;
   scoped_ptr<GestureNavSimple> gesture_nav_simple_;
 
+#if defined(OS_WIN)
+  // The LegacyRenderWidgetHostHWND class provides a dummy HWND which is used
+  // for accessibility, as the container for windowless plugins like
+  // Flash/Silverlight, etc and for legacy drivers for trackpoints/trackpads,
+  // etc.
+  scoped_ptr<LegacyRenderWidgetHostHWND> legacy_hwnd_;
+#endif
+
   // On Windows we can run into problems if resources get released within the
   // initialization phase while the content (and its dimensions) are not known.
   bool is_or_was_visible_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_