Blink-side contiguous allocation of display items.

Source/core/paint/RoundedInnerRectClipper.cpp

Index: Source/core/paint/RoundedInnerRectClipper.cpp
diff --git a/Source/core/paint/RoundedInnerRectClipper.cpp b/Source/core/paint/RoundedInnerRectClipper.cpp
index 5f4274cc6bdedd8a7e88c758d4c57acecfb6c2de..5b56263ebf62c5a47d83482eea3de40b31e79a01 100644
--- a/Source/core/paint/RoundedInnerRectClipper.cpp
+++ b/Source/core/paint/RoundedInnerRectClipper.cpp
@@ -18,34 +18,33 @@ RoundedInnerRectClipper::RoundedInnerRectClipper(LayoutObject& layoutObject, con
     , m_useDisplayItemList(RuntimeEnabledFeatures::slimmingPaintEnabled() && behavior == ApplyToDisplayListIfEnabled)
     , m_clipType(m_useDisplayItemList ? m_paintInfo.displayItemTypeForClipping() : DisplayItem::ClipBoxPaintPhaseFirst)
 {
-    OwnPtr<ClipDisplayItem> clipDisplayItem = ClipDisplayItem::create(layoutObject, m_clipType, LayoutRect::infiniteIntRect());
-
+    OwnPtr<Vector<FloatRoundedRect>> roundedRectClips = adoptPtr(new Vector<FloatRoundedRect>());
     if (clipRect.isRenderable()) {
-        clipDisplayItem->roundedRectClips().append(clipRect);
+        roundedRectClips->append(clipRect);
     } else {
         // We create a rounded rect for each of the corners and clip it, while making sure we clip opposing corners together.
         if (!clipRect.radii().topLeft().isEmpty() || !clipRect.radii().bottomRight().isEmpty()) {
             FloatRect topCorner(clipRect.rect().x(), clipRect.rect().y(), rect.maxX() - clipRect.rect().x(), rect.maxY() - clipRect.rect().y());
             FloatRoundedRect::Radii topCornerRadii;
             topCornerRadii.setTopLeft(clipRect.radii().topLeft());
-            clipDisplayItem->roundedRectClips().append(FloatRoundedRect(topCorner, topCornerRadii));
+            roundedRectClips->append(FloatRoundedRect(topCorner, topCornerRadii));
 
             FloatRect bottomCorner(rect.x().toFloat(), rect.y().toFloat(), clipRect.rect().maxX() - rect.x().toFloat(), clipRect.rect().maxY() - rect.y().toFloat());
             FloatRoundedRect::Radii bottomCornerRadii;
             bottomCornerRadii.setBottomRight(clipRect.radii().bottomRight());
-            clipDisplayItem->roundedRectClips().append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
+            roundedRectClips->append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
         }
 
         if (!clipRect.radii().topRight().isEmpty() || !clipRect.radii().bottomLeft().isEmpty()) {
             FloatRect topCorner(rect.x().toFloat(), clipRect.rect().y(), clipRect.rect().maxX() - rect.x().toFloat(), rect.maxY() - clipRect.rect().y());
             FloatRoundedRect::Radii topCornerRadii;
             topCornerRadii.setTopRight(clipRect.radii().topRight());
-            clipDisplayItem->roundedRectClips().append(FloatRoundedRect(topCorner, topCornerRadii));
+            roundedRectClips->append(FloatRoundedRect(topCorner, topCornerRadii));
 
             FloatRect bottomCorner(clipRect.rect().x(), rect.y().toFloat(), rect.maxX() - clipRect.rect().x(), clipRect.rect().maxY() - rect.y().toFloat());
             FloatRoundedRect::Radii bottomCornerRadii;
             bottomCornerRadii.setBottomLeft(clipRect.radii().bottomLeft());
-            clipDisplayItem->roundedRectClips().append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
+            roundedRectClips->append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
         }
     }
 
@@ -53,9 +52,10 @@ RoundedInnerRectClipper::RoundedInnerRectClipper(LayoutObject& layoutObject, con
         ASSERT(m_paintInfo.context->displayItemList());
         if (m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_paintInfo.context->displayItemList()->add(clipDisplayItem.release());
+        m_paintInfo.context->displayItemList()->createAndAppendIfNeeded<ClipDisplayItem>(layoutObject, m_clipType, LayoutRect::infiniteIntRect(), roundedRectClips.release());
     } else {
-        clipDisplayItem->replay(*paintInfo.context);
+        ClipDisplayItem clipDisplayItem(layoutObject, m_clipType, LayoutRect::infiniteIntRect(), roundedRectClips.release());
+        clipDisplayItem.replay(*paintInfo.context);
     }
 }
 
@@ -66,8 +66,7 @@ RoundedInnerRectClipper::~RoundedInnerRectClipper()
         ASSERT(m_paintInfo.context->displayItemList());
         if (m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled())
             return;
-        OwnPtr<EndClipDisplayItem> endClipDisplayItem = EndClipDisplayItem::create(m_layoutObject, endType);
-        m_paintInfo.context->displayItemList()->add(endClipDisplayItem.release());
+        m_paintInfo.context->displayItemList()->createAndAppendIfNeeded<EndClipDisplayItem>(m_layoutObject, endType);
     } else {
         EndClipDisplayItem endClipDisplayItem(m_layoutObject, endType);
         endClipDisplayItem.replay(*m_paintInfo.context);