Composite sticky-positioned elements when they have composited descendants

third_party/WebKit/Source/platform/graphics/CompositingReasons.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 "platform/graphics/CompositingReasons.h"
 
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
@@ skipping 70 matching lines @@
      "of 3d descendants"},
     {CompositingReasonPreserve3DWith3DDescendants,
      "preserve3DWith3DDescendants",
      "Has a preserves-3d property that needs to be known by compositor because "
      "of 3d descendants"},
     {CompositingReasonReflectionOfCompositedParent,
      "reflectionOfCompositedParent", "Is a reflection of a composited layer"},
     {CompositingReasonIsolateCompositedDescendants,
      "isolateCompositedDescendants",
      "Should isolate descendants to apply a blend effect"},
-    {CompositingReasonPositionFixedWithCompositedDescendants,
-     "positionFixedWithCompositedDescendants"
-     "Is a position:fixed element with composited descendants"},
+    {CompositingReasonPositionFixedOrStickyWithCompositedDescendants,
+     "positionFixedOrStickyWithCompositedDescendants"
+     "Is a position:fixed or position:sticky element with composited "
+     "descendants"},
     {CompositingReasonRoot, "root", "Is the root layer"},
     {CompositingReasonLayerForAncestorClip, "layerForAncestorClip",
      "Secondary layer, applies a clip due to a sibling in the compositing "
      "tree"},
     {CompositingReasonLayerForDescendantClip, "layerForDescendantClip",
      "Secondary layer, to clip descendants of the owning layer"},
     {CompositingReasonLayerForPerspective, "layerForPerspective",
      "Secondary layer, to house the perspective transform for all descendants"},
     {CompositingReasonLayerForHorizontalScrollbar,
      "layerForHorizontalScrollbar",
@@ skipping 51 matching lines @@
     if (reasons & kCompositingReasonStringMap[i].reason) {
       if (builder.length())
         builder.append(',');
       builder.append(kCompositingReasonStringMap[i].shortName);
     }
   }
   return builder.toString();
 }
 
 }  // namespace blink