Ensure LegacyRenderWidgetHostHWND is always created.

content/browser/renderer_host/render_widget_host_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_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 373 matching lines @@
   // Tracks whether SnapToPhysicalPixelBoundary() has been called.
   bool has_snapped_to_boundary() { return has_snapped_to_boundary_; }
   void ResetHasSnappedToBoundary() { has_snapped_to_boundary_ = false; }
 
   // Set the bounds of the window and handle size changes.  Assumes the caller
   // has already adjusted the origin of |rect| to conform to whatever coordinate
   // space is required by the aura::Window.
   void InternalSetBounds(const gfx::Rect& rect);
 
 #if defined(OS_WIN)
+  // Create and/or update the legacy dummy window which corresponds to

[sadrul, 2016/05/24 16:17:39]

*Creates ... *updates

[dmazzoni, 2016/05/24 16:53:09]

Done.

+  // the bounds of the webcontents. It is needed for accessibility and
+  // for scrolling to work in legacy drivers for trackpoints/trackpads, etc.
+  void UpdateLegacyWin();
+
   bool UsesNativeWindowFrame() const;
 #endif
 
   ui::InputMethod* GetInputMethod() const;
 
   // Sends shutdown request.
   void Shutdown();
 
   // Returns whether the widget needs an input grab to work properly.
   bool NeedsInputGrab();
@@ skipping 269 matching lines @@
   bool disable_input_event_router_for_testing_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAura> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_