Add WebContentObserver::OnWebContentsLostFocus()

content/browser/renderer_host/render_view_host_delegate_view.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_VIEW_HOST_DELEGATE_VIEW_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_VIEW_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 43 matching lines @@
                              const DragEventSourceInfo& event_info,
                              RenderWidgetHostImpl* source_rwh) {}
 
   // The page wants to update the mouse cursor during a drag & drop operation.
   // |operation| describes the current operation (none, move, copy, link.)
   virtual void UpdateDragCursor(blink::WebDragOperation operation) {}
 
   // Notification that view for this delegate got the focus.
   virtual void GotFocus() {}
 
+  // Notification that view for this delegate lost the focus.
+  virtual void LostFocus() {}
+
   // Callback to inform the browser that the page is returning the focus to
   // the browser's chrome. If reverse is true, it means the focus was
   // retrieved by doing a Shift-Tab.
   virtual void TakeFocus(bool reverse) {}
 
 #if BUILDFLAG(USE_EXTERNAL_POPUP_MENU)
   // Shows a popup menu with the specified items.
   // This method should call RenderFrameHost::DidSelectPopupMenuItem[s]() or
   // RenderFrameHost::DidCancelPopupMenu() based on the user action.
   virtual void ShowPopupMenu(RenderFrameHost* render_frame_host,
@@ skipping 13 matching lines @@
   virtual ui::OverscrollRefreshHandler* GetOverscrollRefreshHandler() const;
 #endif
 
  protected:
   virtual ~RenderViewHostDelegateView() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_VIEW_H_