(WIP) Invalidation during painting (for synchronized painting)

third_party/WebKit/Source/core/paint/InlinePainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/InlinePainter.h"
 
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutInline.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/layout/line/RootInlineBox.h"
 #include "core/paint/BoxPainter.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/LineBoxListPainter.h"
 #include "core/paint/ObjectPainter.h"
 #include "core/paint/PaintInfo.h"
 #include "platform/geometry/LayoutPoint.h"
 #include <limits>
 
 namespace blink {
 
 void InlinePainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
-    if (RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled() && !paintInfo.context.paintController().skippingCache()) {
-        if (m_layoutInline.paintOffsetChanged(paintOffset)) {
-            paintInfo.context.paintController().invalidatePaintOffset(m_layoutInline);
-            LineBoxListPainter(*m_layoutInline.lineBoxes()).invalidateLineBoxPaintOffsets(paintInfo);
-        }
-        // Set previousPaintOffset here in case that m_layoutInline paints nothing and no
-        // LayoutObjectDrawingRecorder updates its previousPaintOffset.
-        // TODO(wangxianzhu): Integrate paint offset checking into new paint invalidation.
-        m_layoutInline.mutableForPainting().setPreviousPaintOffset(paintOffset);
-    }
-
     if (paintInfo.phase == PaintPhaseForeground && paintInfo.isPrinting())
         ObjectPainter(m_layoutInline).addPDFURLRectIfNeeded(paintInfo, paintOffset);
 
     if (shouldPaintSelfOutline(paintInfo.phase) || shouldPaintDescendantOutlines(paintInfo.phase)) {
         ObjectPainter painter(m_layoutInline);
         if (shouldPaintDescendantOutlines(paintInfo.phase))
             painter.paintInlineChildrenOutlines(paintInfo, paintOffset);
         if (shouldPaintSelfOutline(paintInfo.phase) && !m_layoutInline.isElementContinuation())
             painter.paintOutline(paintInfo, paintOffset);
         return;
     }
 
     LineBoxListPainter(*m_layoutInline.lineBoxes()).paint(m_layoutInline, paintInfo, paintOffset);
 }
 
 } // namespace blink