Invalidate background-attachment:fixed on scroll.

third_party/WebKit/Source/core/layout/LayoutObject.cpp

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index f4b615a98126bd464e28e838a099c7a38c4dd609..0b6993ab9e04f1ce4821564ce9e4c14974c0a82c 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -2539,7 +2539,7 @@ void LayoutObject::willBeDestroyed()
     }
 
     if (frameView())
-        setIsSlowRepaintObject(false);
+        setIsBackgroundAttachmentFixedObject(false);
 }
 
 void LayoutObject::insertedIntoTree()
@@ -3443,16 +3443,16 @@ void LayoutObject::invalidatePaintIncludingNonSelfPaintingLayerDescendants(const
     }
 }
 
-void LayoutObject::setIsSlowRepaintObject(bool isSlowRepaintObject)
+void LayoutObject::setIsBackgroundAttachmentFixedObject(bool isBackgroundAttachmentFixedObject)
 {
     ASSERT(frameView());
-    if (m_bitfields.isSlowRepaintObject() == isSlowRepaintObject)
+    if (m_bitfields.isBackgroundAttachmentFixedObject() == isBackgroundAttachmentFixedObject)
         return;
-    m_bitfields.setIsSlowRepaintObject(isSlowRepaintObject);
-    if (isSlowRepaintObject)
-        frameView()->addSlowRepaintObject();
+    m_bitfields.setIsBackgroundAttachmentFixedObject(isBackgroundAttachmentFixedObject);
+    if (isBackgroundAttachmentFixedObject)
+        frameView()->addBackgroundAttachmentFixedObject(this);
     else
-        frameView()->removeSlowRepaintObject();
+        frameView()->removeBackgroundAttachmentFixedObject(this);
 }
 
 } // namespace blink