Blink changes to record interest rects for http://w3c.github.io/frame-timing/

Source/core/frame/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 37 matching lines @@
 #include "core/rendering/RenderPart.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "public/platform/WebLayer.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefCountedLeakCounter.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
+namespace {
+
+int64_t generateFrameID()
+{
+    // Initialize to the current time to reduce the likelihood of generating
+    // identifiers that overlap with those from past/future browser sessions.
+    static int64_t next = static_cast<int64_t>(currentTime() * 1000000.0);
+    return ++next;
+}
+
+} // namespace
+
 DEFINE_DEBUG_ONLY_GLOBAL(WTF::RefCountedLeakCounter, frameCounter, ("Frame"));
 
 Frame::~Frame()
 {
     ASSERT(!m_owner);
 #ifndef NDEBUG
     frameCounter.decrement();
 #endif
 }
 
@@ skipping 215 matching lines @@
     if (m_host)
         return &m_host->settings();
     return nullptr;
 }
 
 Frame::Frame(FrameClient* client, FrameHost* host, FrameOwner* owner)
     : m_treeNode(this)
     , m_host(host)
     , m_owner(owner)
     , m_client(client)
+    , m_frameID(generateFrameID())
     , m_remotePlatformLayer(nullptr)
     , m_isLoading(false)
 {
     ASSERT(page());
 
 #ifndef NDEBUG
     frameCounter.increment();
 #endif
 
     if (m_owner) {
         if (m_owner->isLocal())
             toHTMLFrameOwnerElement(m_owner)->setContentFrame(*this);
     } else {
         page()->setMainFrame(this);
     }
 }
 
 } // namespace blink