Clear page display after navigation if no rendered output arrives

content/browser/renderer_host/render_widget_host_view_base.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_BASE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 146 matching lines @@
   virtual gfx::Point AccessibilityOriginInScreen(const gfx::Rect& bounds);
   virtual gfx::AcceleratedWidget AccessibilityGetAcceleratedWidget();
   virtual gfx::NativeViewAccessible AccessibilityGetNativeViewAccessible();
 
   // Informs that the focused DOM node has changed.
   virtual void FocusedNodeChanged(bool is_editable_node) {}
 
   virtual void OnSwapCompositorFrame(uint32 output_surface_id,
                                      scoped_ptr<cc::CompositorFrame> frame) {}
 
+  // This method exists to allow removing of displayed graphics, after a new
+  // page has been loaded, to prevent the displayed URL from being out of sync
+  // with what is visible on screen.
+  virtual void ClearCompositorFrame() = 0;
+
   // Because the associated remote WebKit instance can asynchronously
   // prevent-default on a dispatched touch event, the touch events are queued in
   // the GestureRecognizer until invocation of ProcessAckedTouchEvent releases
   // it to be consumed (when |ack_result| is NOT_CONSUMED OR NO_CONSUMER_EXISTS)
   // or ignored (when |ack_result| is CONSUMED).
   virtual void ProcessAckedTouchEvent(const TouchEventWithLatencyInfo& touch,
                                       InputEventAckState ack_result) {}
 
   virtual void DidOverscroll(const DidOverscrollParams& params) {}
 
@@ skipping 252 matching lines @@
   base::OneShotTimer<RenderWidgetHostViewBase> flush_input_timer_;
 
   base::WeakPtrFactory<RenderWidgetHostViewBase> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewBase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_