Blink side of changes to enable cache clearing without a flag.

Source/web/WebPopupMenuImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 63 matching lines @@
     virtual bool confirmComposition(const WebString& text) override final;
     virtual bool compositionRange(size_t* location, size_t* length) override final;
     virtual bool caretOrSelectionRange(size_t* location, size_t* length) override final;
     virtual void setTextDirection(WebTextDirection) override final;
     virtual bool isAcceleratedCompositingActive() const override final { return false; }
     virtual bool isPopupMenu() const override final { return true; }
     virtual void willCloseLayerTreeView() override final;
 
     // WebContentLayerClient
     virtual void paintContents(WebCanvas*, const WebRect& clip, WebContentLayerClient::GraphicsContextStatus = GraphicsContextEnabled) override final;
-    virtual void paintContents(WebDisplayItemList*, const WebRect& clip, WebContentLayerClient::GraphicsContextStatus = GraphicsContextEnabled) override final { }
+    virtual void paintContents(WebDisplayItemList*, const WebRect& clip, const bool clearCaches = false,
+        WebContentLayerClient::GraphicsContextStatus = GraphicsContextEnabled) override final { }
 
     // WebPopupMenuImpl
     void initialize(PopupContainer* widget, const WebRect& bounds);
 
     WebWidgetClient* client() { return m_client; }
 
     void handleMouseMove(const WebMouseEvent&);
     void handleMouseLeave(const WebMouseEvent&);
     void handleMouseDown(const WebMouseEvent&);
     void handleMouseUp(const WebMouseEvent&);
@@ skipping 33 matching lines @@
 };
 
 DEFINE_TYPE_CASTS(WebPopupMenuImpl, WebWidget, widget, widget->isPopupMenu(), widget.isPopupMenu());
 // WebPopupMenuImpl is the only implementation of PopupContainerClient, so
 // no need for further checking.
 DEFINE_TYPE_CASTS(WebPopupMenuImpl, PopupContainerClient, client, true, true);
 
 } // namespace blink
 
 #endif