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 <stdint.h>
 #include "platform/PlatformExport.h"
 #include "platform/wtf/Allocator.h"
@@ skipping 45 matching lines @@
 const uint64_t kCompositingReasonClipsCompositingDescendants = UINT64_C(1)
                                                                << 25;
 const uint64_t kCompositingReasonPerspectiveWith3DDescendants = UINT64_C(1)
                                                                 << 26;
 const uint64_t kCompositingReasonPreserve3DWith3DDescendants = UINT64_C(1)
                                                                << 27;
 const uint64_t kCompositingReasonReflectionOfCompositedParent = UINT64_C(1)
                                                                 << 28;
 const uint64_t kCompositingReasonIsolateCompositedDescendants = UINT64_C(1)
                                                                 << 29;
-const uint64_t kCompositingReasonPositionFixedWithCompositedDescendants =
-    UINT64_C(1) << 30;
+const uint64_t
+    kCompositingReasonPositionFixedOrStickyWithCompositedDescendants =
+        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 kCompositingReasonRoot = UINT64_C(1) << 31;
 
 // CompositedLayerMapping internal hierarchy reasons
 const uint64_t kCompositingReasonLayerForAncestorClip = UINT64_C(1) << 32;
 const uint64_t kCompositingReasonLayerForDescendantClip = UINT64_C(1) << 33;
 const uint64_t kCompositingReasonLayerForPerspective = UINT64_C(1) << 34;
 const uint64_t kCompositingReasonLayerForHorizontalScrollbar = UINT64_C(1)
@@ skipping 45 matching lines @@
 
 const uint64_t kCompositingReasonComboCompositedDescendants =
     kCompositingReasonTransformWithCompositedDescendants |
     kCompositingReasonIsolateCompositedDescendants |
     kCompositingReasonOpacityWithCompositedDescendants |
     kCompositingReasonMaskWithCompositedDescendants |
     kCompositingReasonFilterWithCompositedDescendants |
     kCompositingReasonBlendingWithCompositedDescendants |
     kCompositingReasonReflectionWithCompositedDescendants |
     kCompositingReasonClipsCompositingDescendants |
-    kCompositingReasonPositionFixedWithCompositedDescendants;
+    kCompositingReasonPositionFixedOrStickyWithCompositedDescendants;
 
 const uint64_t kCompositingReasonCombo3DDescendants =
     kCompositingReasonPreserve3DWith3DDescendants |
     kCompositingReasonPerspectiveWith3DDescendants;
 
 const uint64_t kCompositingReasonComboAllStyleDeterminedReasons =
     kCompositingReasonComboAllDirectStyleDeterminedReasons |
     kCompositingReasonComboCompositedDescendants |
     kCompositingReasonCombo3DDescendants | kCompositingReasonInlineTransform;
 
 const uint64_t kCompositingReasonComboReasonsThatRequireOwnBacking =
     kCompositingReasonComboAllDirectReasons | kCompositingReasonOverlap |
     kCompositingReasonAssumedOverlap |
     kCompositingReasonNegativeZIndexChildren |
     kCompositingReasonSquashingDisallowed |
     kCompositingReasonTransformWithCompositedDescendants |
     kCompositingReasonOpacityWithCompositedDescendants |
     kCompositingReasonMaskWithCompositedDescendants |
     kCompositingReasonFilterWithCompositedDescendants |
     kCompositingReasonBlendingWithCompositedDescendants |
     kCompositingReasonIsolateCompositedDescendants |
     kCompositingReasonPreserve3DWith3DDescendants |  // preserve-3d has to
                                                      // create a backing store
                                                      // to ensure that
                                                      // 3d-transformed elements
                                                      // intersect.
     kCompositingReasonBackdropFilter |
-    kCompositingReasonPositionFixedWithCompositedDescendants;
+    kCompositingReasonPositionFixedOrStickyWithCompositedDescendants;
 
 const uint64_t kCompositingReasonComboSquashableReasons =
     kCompositingReasonOverlap | kCompositingReasonAssumedOverlap |
     kCompositingReasonOverflowScrollingParent;
 
 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