Ensure LegacyRenderWidgetHostHWND is always created.

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>
 
@@ skipping 35 matching lines @@
       public aura::WindowDelegate,
       public aura::client::DragDropDelegate,
       public aura::WindowObserver {
  public:
   WebContentsViewAura(WebContentsImpl* web_contents,
                       WebContentsViewDelegate* delegate);
 
   // Allow the WebContentsViewDelegate to be set explicitly.
   void SetDelegateForTesting(WebContentsViewDelegate* delegate);
 
+  // Set a flag to pass nullptr as the parent_view argument to
+  // RenderWidgetHostViewAura::InitAsChild().
+  void set_init_rwhv_with_null_parent_for_testing(bool set) {
+    init_rwhv_with_null_parent_for_testing_ = set;
+  }
+
  private:
   class WindowObserver;
 
   ~WebContentsViewAura() override;
 
   void SizeChangedCommon(const gfx::Size& size);
 
   void EndDrag(blink::WebDragOperationsMask ops);
 
   void InstallOverscrollControllerDelegate(RenderWidgetHostViewAura* view);
 
   // Sets up the content window in preparation for starting an overscroll
   // gesture.
   void PrepareContentWindowForOverscroll();
 
   // Completes the navigation in response to a completed overscroll gesture.
   // The navigation happens after an animation (either the overlay window
   // animates in, or the content window animates out).
   void CompleteOverscrollNavigation(OverscrollMode mode);
 
   void OverscrollUpdateForWebContentsDelegate(float delta_y);
 
   ui::TouchSelectionController* GetSelectionController() const;
   TouchSelectionControllerClientAura* GetSelectionControllerClient() const;
 
+  // Returns GetNativeView unless overridden for testing.
+  gfx::NativeView GetRenderWidgetHostViewParent() const;
+
   // Overridden from WebContentsView:
   gfx::NativeView GetNativeView() const override;
   gfx::NativeView GetContentNativeView() const override;
   gfx::NativeWindow GetTopLevelNativeWindow() const override;
   void GetContainerBounds(gfx::Rect* out) const override;
   void SizeContents(const gfx::Size& size) override;
   void Focus() override;
   void SetInitialFocus() override;
   void StoreFocus() override;
   void RestoreFocus() override;
@@ skipping 92 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_;
 
+  bool init_rwhv_with_null_parent_for_testing_;
+
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_