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 <memory>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.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/wm/public/drag_drop_delegate.h"
 
+#if defined(OS_WIN)
+#include "content/browser/renderer_host/legacy_render_widget_host_win.h"
+#include "content/browser/renderer_host/legacy_render_widget_host_win_delegate.h"
+#endif
+
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class DropTargetEvent;
 class TouchSelectionController;
 }
 
 namespace content {
 class GestureNavSimple;
 class OverscrollNavigationOverlay;
 class RenderWidgetHostImpl;
 class RenderWidgetHostViewAura;
 class ShadowLayerDelegate;
 class TouchSelectionControllerClientAura;
 class WebContentsViewDelegate;
 class WebContentsImpl;
 class WebDragDestDelegate;
 
+#if defined(OS_WIN)
+class LegacyRenderWidgetHostHWND;
+#endif
+
 class CONTENT_EXPORT WebContentsViewAura
     : NON_EXPORTED_BASE(public WebContentsView),
+#if defined(OS_WIN)
+      public LegacyRenderWidgetHostHWNDDelegate,
+#endif
       public RenderViewHostDelegateView,
       public OverscrollControllerDelegate,
       public aura::WindowDelegate,
       public aura::client::DragDropDelegate,
       public aura::WindowObserver {
  public:
   WebContentsViewAura(WebContentsImpl* web_contents,
                       WebContentsViewDelegate* delegate);
 
   // Allow the WebContentsViewDelegate to be set explicitly.
@@ skipping 95 matching lines @@
   void OnDragEntered(const ui::DropTargetEvent& event) override;
   int OnDragUpdated(const ui::DropTargetEvent& event) override;
   void OnDragExited() override;
   int OnPerformDrop(const ui::DropTargetEvent& event) override;
 
   // Overridden from aura::WindowObserver:
   void OnWindowVisibilityChanged(aura::Window* window, bool visible) override;
 
   FRIEND_TEST_ALL_PREFIXES(WebContentsViewAuraTest, EnableDisableOverscroll);
 
+#if defined(OS_WIN)
+  // Overridden from LegacyRenderWidgetHostHWNDDelegate:
+  gfx::NativeViewAccessible GetNativeViewAccessible() override;
+#endif
+
   std::unique_ptr<aura::Window> window_;
 
   std::unique_ptr<WindowObserver> window_observer_;
 
   // The WebContentsImpl whose contents we display.
   WebContentsImpl* web_contents_;
 
   std::unique_ptr<WebContentsViewDelegate> delegate_;
 
   blink::WebDragOperationsMask current_drag_op_;
@@ skipping 14 matching lines @@
   // 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.
   std::unique_ptr<OverscrollNavigationOverlay> navigation_overlay_;
 
   std::unique_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.
+  std::unique_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_