[WIP] Adding support for <iframe>s to slimming paint.

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
 */
 
 #ifndef FrameView_h
 #define FrameView_h
 
 #include "core/frame/FrameViewAutoSizeInfo.h"
+#include "core/paint/ViewDisplayList.h"
 #include "core/rendering/PaintPhase.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/Widget.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/Color.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "platform/scroll/Scrollbar.h"
 #include "wtf/Forward.h"
@@ skipping 471 matching lines @@
     virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const override;
 
     virtual bool isFrameView() const override { return true; }
 
     virtual void trace(Visitor*) override;
     void notifyPageThatContentAreaWillPaint() const;
     FrameView* parentFrameView() const;
 
     void calculateOverhangAreasForPainting(IntRect& horizontalOverhangRect, IntRect& verticalOverhangRect);
 
+    ViewDisplayList& viewDisplayList()

[chrishtr, 2014/11/01 23:44:10]

Don't inline this.

[trchen, 2014/11/02 10:36:46]

Acknowledged.

+    {
+        ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());
+        ASSERT(frame().isLocalRoot());
+        if (!m_viewDisplayList)
+            m_viewDisplayList = adoptPtr(new ViewDisplayList());
+        return *m_viewDisplayList;
+    }
+
 protected:
     // Scroll the content via the compositor.
     bool scrollContentsFastPath(const IntSize& scrollDelta);
 
     // Scroll the content by invalidating everything.
     void scrollContentsSlowPath(const IntRect& updateRect);
 
     bool isVerticalDocument() const;
     bool isFlippedDocument() const;
 
@@ skipping 241 matching lines @@
 
     int m_scrollbarsAvoidingResizer;
     bool m_scrollbarsSuppressed;
 
     bool m_inUpdateScrollbars;
 
     IntPoint m_panScrollIconPoint;
     bool m_shouldDrawPanScrollIcon;
 
     bool m_clipsRepaints;
+
+    OwnPtr<ViewDisplayList> m_viewDisplayList;
 };
 
 inline void FrameView::incrementVisuallyNonEmptyCharacterCount(unsigned count)
 {
     if (m_isVisuallyNonEmpty)
         return;
     m_visuallyNonEmptyCharacterCount += count;
     // Use a threshold value to prevent very small amounts of visible content from triggering didFirstVisuallyNonEmptyLayout.
     // The first few hundred characters rarely contain the interesting content of the page.
     static const unsigned visualCharacterThreshold = 200;
@@ skipping 36 matching lines @@
     }
 
 private:
     RawPtrWillBeMember<FrameView> m_view;
     bool m_originalValue;
 };
 
 } // namespace blink
 
 #endif // FrameView_h