Add WebContentObserver::OnWebContentsLostFocus()

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 119 matching lines @@
   void ShowContextMenu(RenderFrameHost* render_frame_host,
                        const ContextMenuParams& params) override;
   void StartDragging(const DropData& drop_data,
                      blink::WebDragOperationsMask operations,
                      const gfx::ImageSkia& image,
                      const gfx::Vector2d& image_offset,
                      const DragEventSourceInfo& event_info,
                      RenderWidgetHostImpl* source_rwh) override;
   void UpdateDragCursor(blink::WebDragOperation operation) override;
   void GotFocus() override;
+  void LostFocus() override;
   void TakeFocus(bool reverse) override;
 #if BUILDFLAG(USE_EXTERNAL_POPUP_MENU)
   void ShowPopupMenu(RenderFrameHost* render_frame_host,
                      const gfx::Rect& bounds,
                      int item_height,
                      double item_font_size,
                      int selected_item,
                      const std::vector<MenuItem>& items,
                      bool right_aligned,
                      bool allow_multiple_selection) override;
@@ skipping 96 matching lines @@
   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_