Add enum that specifies the frame detachment reason.

public/web/WebFrame.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 71 matching lines @@
 struct WebFloatRect;
 struct WebPoint;
 struct WebPrintParams;
 struct WebRect;
 struct WebScriptSource;
 struct WebSize;
 struct WebURLLoaderOptions;
 
 template <typename T> class WebVector;
 
+// Used in detach().
+enum class WebDetachReason { Remove, Swap };

[dcheng, 2015/05/29 22:01:21]

I would put this in WebFrameClient, since that's where we'll use it. I'd
probably define it inside WebFrameClient as well; that way, you can skip the
"Web" prefix.

+
 // Frames may be rendered in process ('local') or out of process ('remote').
 // A remote frame is always cross-site; a local frame may be either same-site or
 // cross-site.
 // WebFrame is the base class for both WebLocalFrame and WebRemoteFrame and
 // contains methods that are valid on both local and remote frames, such as
 // getting a frame's parent or its opener.
 class WebFrame {
 public:
     // Control of layoutTreeAsText output
     enum LayoutAsTextControl {
@@ skipping 630 matching lines @@
     WebPrivateOwnPtr<OpenedFrameTracker> m_openedFrameTracker;
 };
 
 #if BLINK_IMPLEMENTATION
 Frame* toCoreFrame(const WebFrame*);
 #endif
 
 } // namespace blink
 
 #endif