Implement frame attribution (FrameBlamer)

third_party/WebKit/Source/core/frame/Frame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 14 matching lines @@
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef Frame_h
 #define Frame_h
 
 #include "core/CoreExport.h"
 #include "core/frame/FrameTypes.h"
 #include "core/loader/FrameLoaderTypes.h"
 #include "core/page/FrameTree.h"
+#include "platform/TraceEvent.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class ChromeClient;
 class DOMWindow;
 class DOMWrapperWorld;
 class Document;
@@ skipping 91 matching lines @@
 protected:
     Frame(FrameClient*, FrameHost*, FrameOwner*);
 
     mutable FrameTree m_treeNode;
 
     RawPtrWillBeMember<FrameHost> m_host;
     RawPtrWillBeMember<FrameOwner> m_owner;
 
 private:
     RawPtrWillBeMember<FrameClient> m_client;
-    // Needed to identify Frame Timing requests.
+    // Needed to identify Frame Timing requests. Also used for trace-based frame blaming.
     int64_t m_frameID;
     bool m_isLoading;
 };
 
 inline FrameClient* Frame::client() const
 {
     return m_client;
 }
 
 inline FrameOwner* Frame::owner() const
 {
     return m_owner;
 }
 
 inline FrameTree& Frame::tree() const
 {
     return m_treeNode;
 }
 
 // Allow equality comparisons of Frames by reference or pointer, interchangeably.
 DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES_REFCOUNTED(Frame)
 
 } // namespace blink
 
 #endif // Frame_h