Fix keyboard focus for OOPIF-<webview>.

content/browser/web_contents/web_contents_view_child_frame.cc

 // Copyright (c) 2016 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.
 
 #include "content/browser/web_contents/web_contents_view_child_frame.h"
 
 #include "build/build_config.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/web_contents_view_delegate.h"
@@ skipping 123 matching lines @@
 
 void WebContentsViewChildFrame::UpdateDragCursor(WebDragOperation operation) {
   NOTREACHED();
 }
 
 void WebContentsViewChildFrame::GotFocus() {
   NOTREACHED();
 }
 
 void WebContentsViewChildFrame::TakeFocus(bool reverse) {
-  NOTREACHED();
+  // TODO(avallee): http://crbug.com/610819 Advance focus to next element in
+  // embedder

[nasko, 2016/07/28 16:43:05]

nit: "in outer WebContents"? Also, end the comment with a period.

 }
 
 void WebContentsViewChildFrame::ShowContextMenu(
     RenderFrameHost* render_frame_host,
     const ContextMenuParams& params) {
   NOTREACHED();
 }
 
 void WebContentsViewChildFrame::StartDragging(
     const DropData& drop_data,
     WebDragOperationsMask ops,
     const gfx::ImageSkia& image,
     const gfx::Vector2d& image_offset,
     const DragEventSourceInfo& event_info) {
   NOTREACHED();
 }
 
 }  // namespace content