Add compositor element id for scroll nodes in SPv2.

third_party/WebKit/Source/platform/graphics/paint/ScrollPaintPropertyNode.h

 // Copyright 2016 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 ScrollPaintPropertyNode_h
 #define ScrollPaintPropertyNode_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatSize.h"
+#include "platform/graphics/CompositorElementId.h"
 #include "platform/graphics/paint/TransformPaintPropertyNode.h"
 #include "platform/scroll/MainThreadScrollingReason.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
 #include <iosfwd>
 
 namespace blink {
@@ skipping 13 matching lines @@
   // This node is really a sentinel, and does not represent a real scroll.
   static ScrollPaintPropertyNode* root();
 
   static PassRefPtr<ScrollPaintPropertyNode> create(
       PassRefPtr<const ScrollPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> scrollOffsetTranslation,
       const IntSize& clip,
       const IntSize& bounds,
       bool userScrollableHorizontal,
       bool userScrollableVertical,
-      MainThreadScrollingReasons mainThreadScrollingReasons) {
+      MainThreadScrollingReasons mainThreadScrollingReasons,
+      const CompositorElementId& compositorElementId = CompositorElementId()) {
     return adoptRef(new ScrollPaintPropertyNode(
         std::move(parent), std::move(scrollOffsetTranslation), clip, bounds,
         userScrollableHorizontal, userScrollableVertical,
-        mainThreadScrollingReasons));
+        mainThreadScrollingReasons, compositorElementId));
   }
 
   void update(
       PassRefPtr<const ScrollPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> scrollOffsetTranslation,
       const IntSize& clip,
       const IntSize& bounds,
       bool userScrollableHorizontal,
       bool userScrollableVertical,
-      MainThreadScrollingReasons mainThreadScrollingReasons) {
+      MainThreadScrollingReasons mainThreadScrollingReasons,
+      CompositorElementId compositorElementId = CompositorElementId()) {
     DCHECK(!isRoot());
     DCHECK(parent != this);
     m_parent = parent;
     DCHECK(scrollOffsetTranslation->matrix().isIdentityOr2DTranslation());
     m_scrollOffsetTranslation = scrollOffsetTranslation;
     m_clip = clip;
     m_bounds = bounds;
     m_userScrollableHorizontal = userScrollableHorizontal;
     m_userScrollableVertical = userScrollableVertical;
     m_mainThreadScrollingReasons = mainThreadScrollingReasons;
+    m_compositorElementId = compositorElementId;
   }
 
   const ScrollPaintPropertyNode* parent() const { return m_parent.get(); }
   bool isRoot() const { return !m_parent; }
 
   // Transform that the scroll is relative to.
   const TransformPaintPropertyNode* scrollOffsetTranslation() const {
     return m_scrollOffsetTranslation.get();
   }
 
   // The clipped area that contains the scrolled content.
   const IntSize& clip() const { return m_clip; }
 
   // The bounds of the content that is scrolled within |clip|.
   const IntSize& bounds() const { return m_bounds; }
 
   bool userScrollableHorizontal() const { return m_userScrollableHorizontal; }
   bool userScrollableVertical() const { return m_userScrollableVertical; }
 
   // Return reason bitfield with values from cc::MainThreadScrollingReason.
   MainThreadScrollingReasons mainThreadScrollingReasons() const {
     return m_mainThreadScrollingReasons;
   }
 
+  const CompositorElementId& compositorElementId() const {
+    return m_compositorElementId;
+  }
+
   // Main thread scrolling reason for the threaded scrolling disabled setting.
   bool threadedScrollingDisabled() const {
     return m_mainThreadScrollingReasons &
            MainThreadScrollingReason::kThreadedScrollingDisabled;
   }
 
   // Main thread scrolling reason for background attachment fixed descendants.
   bool hasBackgroundAttachmentFixedDescendants() const {
     return m_mainThreadScrollingReasons &
            MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects;
   }
 
 #if DCHECK_IS_ON()
   // The clone function is used by FindPropertiesNeedingUpdate.h for recording
   // a scroll node before it has been updated, to later detect changes.
   PassRefPtr<ScrollPaintPropertyNode> clone() const {
     RefPtr<ScrollPaintPropertyNode> cloned =
         adoptRef(new ScrollPaintPropertyNode(
             m_parent, m_scrollOffsetTranslation, m_clip, m_bounds,
             m_userScrollableHorizontal, m_userScrollableVertical,
-            m_mainThreadScrollingReasons));
+            m_mainThreadScrollingReasons, m_compositorElementId));
     return cloned;
   }
 
   // The equality operator is used by FindPropertiesNeedingUpdate.h for checking
   // if a scroll node has changed.
   bool operator==(const ScrollPaintPropertyNode& o) const {
     return m_parent == o.m_parent &&
            m_scrollOffsetTranslation == o.m_scrollOffsetTranslation &&
            m_clip == o.m_clip && m_bounds == o.m_bounds &&
            m_userScrollableHorizontal == o.m_userScrollableHorizontal &&
            m_userScrollableVertical == o.m_userScrollableVertical &&
-           m_mainThreadScrollingReasons == o.m_mainThreadScrollingReasons;
+           m_mainThreadScrollingReasons == o.m_mainThreadScrollingReasons &&
+           m_compositorElementId == o.m_compositorElementId;
   }
 #endif
 
   String toString() const;
 
  private:
   ScrollPaintPropertyNode(
       PassRefPtr<const ScrollPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> scrollOffsetTranslation,
       IntSize clip,
       IntSize bounds,
       bool userScrollableHorizontal,
       bool userScrollableVertical,
-      MainThreadScrollingReasons mainThreadScrollingReasons)
+      MainThreadScrollingReasons mainThreadScrollingReasons,
+      CompositorElementId compositorElementId)
       : m_parent(parent),
         m_scrollOffsetTranslation(scrollOffsetTranslation),
         m_clip(clip),
         m_bounds(bounds),
         m_userScrollableHorizontal(userScrollableHorizontal),
         m_userScrollableVertical(userScrollableVertical),
-        m_mainThreadScrollingReasons(mainThreadScrollingReasons) {
+        m_mainThreadScrollingReasons(mainThreadScrollingReasons),
+        m_compositorElementId(compositorElementId) {
     DCHECK(m_scrollOffsetTranslation->matrix().isIdentityOr2DTranslation());
   }
 
   RefPtr<const ScrollPaintPropertyNode> m_parent;
   RefPtr<const TransformPaintPropertyNode> m_scrollOffsetTranslation;
   IntSize m_clip;
   IntSize m_bounds;
   bool m_userScrollableHorizontal : 1;
   bool m_userScrollableVertical : 1;
   MainThreadScrollingReasons m_mainThreadScrollingReasons;
+  CompositorElementId m_compositorElementId;
 };
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/PaintPrinters.h.
 void PrintTo(const ScrollPaintPropertyNode&, std::ostream*);
 
 }  // namespace blink
 
 #endif  // ScrollPaintPropertyNode_h