(WIP) Invalidation during painting (for synchronized painting)

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

Index: third_party/WebKit/Source/core/paint/BoxPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/BoxPainter.cpp b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
index 3d6d0f913eb04a570f2d45cd7e6e13d36f321766..2117be052dd3980d973782fc30aab5366725cab9 100644
--- a/third_party/WebKit/Source/core/paint/BoxPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/BoxPainter.cpp
@@ -38,6 +38,7 @@ namespace blink {
 void BoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     LayoutPoint adjustedPaintOffset = paintOffset + m_layoutBox.location();
+
     // Default implementation. Just pass paint through to the children.
     PaintInfo childInfo(paintInfo);
     for (LayoutObject* child = m_layoutBox.slowFirstChild(); child; child = child->nextSibling())
@@ -78,10 +79,10 @@ void BoxPainter::paintBoxDecorationBackgroundWithRect(const PaintInfo& paintInfo
     if (style.appearance() == MediaSliderPart)
         cacheSkipper.emplace(paintInfo.context);
 
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutBox, DisplayItem::BoxDecorationBackground, paintOffset))
+    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutBox, DisplayItem::BoxDecorationBackground))
         return;
 
-    LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutBox, DisplayItem::BoxDecorationBackground, boundsForDrawingRecorder(paintOffset), paintOffset);
+    LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutBox, DisplayItem::BoxDecorationBackground, boundsForDrawingRecorder(paintOffset));
 
     BoxDecorationData boxDecorationData(m_layoutBox);
 
@@ -488,13 +489,13 @@ void BoxPainter::paintMask(const PaintInfo& paintInfo, const LayoutPoint& paintO
     if (m_layoutBox.style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
         return;
 
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutBox, paintInfo.phase, paintOffset))
+    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutBox, paintInfo.phase))
         return;
 
     LayoutRect visualOverflowRect(m_layoutBox.visualOverflowRect());
     visualOverflowRect.moveBy(paintOffset);
 
-    LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutBox, paintInfo.phase, visualOverflowRect, paintOffset);
+    LayoutObjectDrawingRecorder recorder(paintInfo.context, m_layoutBox, paintInfo.phase, visualOverflowRect);
     LayoutRect paintRect = LayoutRect(paintOffset, m_layoutBox.size());
     paintMaskImages(paintInfo, paintRect);
 }
@@ -541,11 +542,11 @@ void BoxPainter::paintClippingMask(const PaintInfo& paintInfo, const LayoutPoint
     if (!m_layoutBox.layer() || m_layoutBox.layer()->compositingState() != PaintsIntoOwnBacking)
         return;
 
-    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutBox, paintInfo.phase, paintOffset))
+    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(paintInfo.context, m_layoutBox, paintInfo.phase))
         return;
 
     IntRect paintRect = pixelSnappedIntRect(LayoutRect(paintOffset, m_layoutBox.size()));
-    LayoutObjectDrawingRecorder drawingRecorder(paintInfo.context, m_layoutBox, paintInfo.phase, paintRect, paintOffset);
+    LayoutObjectDrawingRecorder drawingRecorder(paintInfo.context, m_layoutBox, paintInfo.phase, paintRect);
     paintInfo.context.fillRect(paintRect, Color::black);
 }