Fix keyboard focus for OOPIF-<webview>.

third_party/WebKit/public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 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 183 matching lines @@
     // Focus ---------------------------------------------------------------
 
     virtual WebLocalFrame* focusedFrame() = 0;
     virtual void setFocusedFrame(WebFrame*) = 0;
 
     // Sets the provided frame as focused and fires blur/focus events on any
     // currently focused elements in old/new focused documents.  Note that this
     // is different from setFocusedFrame, which does not fire events on focused
     // elements.
     virtual void focusDocumentView(WebFrame*) = 0;
+    virtual void unfocusDocumentView() = 0;

[dcheng, 2016/07/28 02:14:18]

Nit: let's add a comment for this, even if it's fairly obvious what it should
do. Perhaps the comment could describe why this is a useful API to add.

[avallee, 2016/07/28 02:49:15]

Done.

 
     // Focus the first (last if reverse is true) focusable node.
     virtual void setInitialFocus(bool reverse) = 0;
 
     // Clears the focused element (and selection if a text field is focused)
     // to ensure that a text field on the page is not eating keystrokes we
     // send it.
     virtual void clearFocusedElement() = 0;
 
     // If it is editable, scrolls the element currently in focus into |rect|,
@@ skipping 313 matching lines @@
     // completed.
     WebWidget* widget() { return this; }
 
 protected:
     ~WebView() {}
 };
 
 } // namespace blink
 
 #endif