Composite sticky-positioned elements when they have composited descendants

third_party/WebKit/Source/platform/graphics/CompositingReasons.h

 // 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.
 
 #ifndef CompositingReasons_h
 #define CompositingReasons_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Allocator.h"
 #include "wtf/text/WTFString.h"
@@ skipping 43 matching lines @@
 const uint64_t CompositingReasonBlendingWithCompositedDescendants = UINT64_C(1)
                                                                     << 24;
 const uint64_t CompositingReasonClipsCompositingDescendants = UINT64_C(1) << 25;
 const uint64_t CompositingReasonPerspectiveWith3DDescendants = UINT64_C(1)
                                                                << 26;
 const uint64_t CompositingReasonPreserve3DWith3DDescendants = UINT64_C(1) << 27;
 const uint64_t CompositingReasonReflectionOfCompositedParent = UINT64_C(1)
                                                                << 28;
 const uint64_t CompositingReasonIsolateCompositedDescendants = UINT64_C(1)
                                                                << 29;
-const uint64_t CompositingReasonPositionFixedWithCompositedDescendants =
+const uint64_t CompositingReasonPositionFixedOrStickyWithCompositedDescendants =
     UINT64_C(1) << 30;
 
 // The root layer is a special case. It may be forced to be a layer, but it also
 // needs to be a layer if anything else in the subtree is composited.
 const uint64_t CompositingReasonRoot = UINT64_C(1) << 31;
 
 // CompositedLayerMapping internal hierarchy reasons
 const uint64_t CompositingReasonLayerForAncestorClip = UINT64_C(1) << 32;
 const uint64_t CompositingReasonLayerForDescendantClip = UINT64_C(1) << 33;
 const uint64_t CompositingReasonLayerForPerspective = UINT64_C(1) << 34;
@@ skipping 45 matching lines @@
 
 const uint64_t CompositingReasonComboCompositedDescendants =
     CompositingReasonTransformWithCompositedDescendants |
     CompositingReasonIsolateCompositedDescendants |
     CompositingReasonOpacityWithCompositedDescendants |
     CompositingReasonMaskWithCompositedDescendants |
     CompositingReasonFilterWithCompositedDescendants |
     CompositingReasonBlendingWithCompositedDescendants |
     CompositingReasonReflectionWithCompositedDescendants |
     CompositingReasonClipsCompositingDescendants |
-    CompositingReasonPositionFixedWithCompositedDescendants;
+    CompositingReasonPositionFixedOrStickyWithCompositedDescendants;
 
 const uint64_t CompositingReasonCombo3DDescendants =
     CompositingReasonPreserve3DWith3DDescendants |
     CompositingReasonPerspectiveWith3DDescendants;
 
 const uint64_t CompositingReasonComboAllStyleDeterminedReasons =
     CompositingReasonComboAllDirectStyleDeterminedReasons |
     CompositingReasonComboCompositedDescendants |
     CompositingReasonCombo3DDescendants | CompositingReasonInlineTransform;
 
 const uint64_t CompositingReasonComboReasonsThatRequireOwnBacking =
     CompositingReasonComboAllDirectReasons | CompositingReasonOverlap |
     CompositingReasonAssumedOverlap | CompositingReasonNegativeZIndexChildren |
     CompositingReasonSquashingDisallowed |
     CompositingReasonTransformWithCompositedDescendants |
     CompositingReasonOpacityWithCompositedDescendants |
     CompositingReasonMaskWithCompositedDescendants |
     CompositingReasonFilterWithCompositedDescendants |
     CompositingReasonBlendingWithCompositedDescendants |
     CompositingReasonIsolateCompositedDescendants |
     CompositingReasonPreserve3DWith3DDescendants |  // preserve-3d has to create
                                                     // a backing store to ensure
                                                     // that 3d-transformed
                                                     // elements intersect.
     CompositingReasonBackdropFilter |
-    CompositingReasonPositionFixedWithCompositedDescendants;
+    CompositingReasonPositionFixedOrStickyWithCompositedDescendants;
 
 const uint64_t CompositingReasonComboSquashableReasons =
     CompositingReasonOverlap | CompositingReasonAssumedOverlap |
     CompositingReasonOverflowScrollingParent;
 
 typedef uint64_t CompositingReasons;
 
 // Any reasons other than overlap or assumed overlap will require the layer to
 // be separately compositing.
 inline bool requiresCompositing(CompositingReasons reasons) {
@@ skipping 15 matching lines @@
 };
 
 PLATFORM_EXPORT extern const CompositingReasonStringMap
     kCompositingReasonStringMap[];
 PLATFORM_EXPORT extern const size_t kNumberOfCompositingReasons;
 PLATFORM_EXPORT String compositingReasonsAsString(CompositingReasons);
 
 }  // namespace blink
 
 #endif  // CompositingReasons_h