Set layer scroll data from PaintArtifactCompositor

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp

 // Copyright 2015 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 "core/paint/PaintPropertyTreeBuilder.h"
 
 #include "core/dom/DOMNodeIds.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
@@ skipping 70 matching lines @@
 static bool updateScrollTranslation(
     FrameView& frameView,
     PassRefPtr<const TransformPaintPropertyNode> parent,
     const TransformationMatrix& matrix,
     const FloatPoint3D& origin,
     PassRefPtr<const ScrollPaintPropertyNode> scrollParent,
     const IntSize& clip,
     const IntSize& bounds,
     bool userScrollableHorizontal,
     bool userScrollableVertical,
-    MainThreadScrollingReasons mainThreadScrollingReasons) {
+    MainThreadScrollingReasons mainThreadScrollingReasons,
+    WebLayerScrollClient* scrollClient) {
   DCHECK(!RuntimeEnabledFeatures::rootLayerScrollingEnabled());
   CompositorElementId compositorElementId =
       createDomNodeBasedCompositorElementId(*frameView.layoutView());
   if (auto* existingScrollTranslation = frameView.scrollTranslation()) {
     auto existingReasons =
         existingScrollTranslation->scrollNode()->mainThreadScrollingReasons();
     existingScrollTranslation->updateScrollTranslation(
         std::move(parent), matrix, origin, false, 0, CompositingReasonNone,
         compositorElementId, std::move(scrollParent), clip, bounds,
         userScrollableHorizontal, userScrollableVertical,
-        mainThreadScrollingReasons);
+        mainThreadScrollingReasons, scrollClient);
     return existingReasons != mainThreadScrollingReasons;
   }
   frameView.setScrollTranslation(
       TransformPaintPropertyNode::createScrollTranslation(
           std::move(parent), matrix, origin, false, 0, CompositingReasonNone,
           compositorElementId, std::move(scrollParent), clip, bounds,
           userScrollableHorizontal, userScrollableVertical,
-          mainThreadScrollingReasons));
+          mainThreadScrollingReasons, scrollClient));
   return true;
 }
 
 static MainThreadScrollingReasons mainThreadScrollingReasons(
     const FrameView& frameView,
     MainThreadScrollingReasons ancestorReasons) {
   auto reasons = ancestorReasons;
   if (!frameView.frame().settings()->getThreadedScrollingEnabled())
     reasons |= MainThreadScrollingReason::kThreadedScrollingDisabled;
   if (frameView.hasBackgroundAttachmentFixedObjects())
@@ skipping 47 matching lines @@
       bool userScrollableVertical =
           frameView.userInputScrollable(VerticalScrollbar);
 
       auto ancestorReasons =
           context.current.scroll->mainThreadScrollingReasons();
       auto reasons = mainThreadScrollingReasons(frameView, ancestorReasons);
 
       context.forceSubtreeUpdate |= updateScrollTranslation(
           frameView, frameView.preTranslation(), frameScroll, FloatPoint3D(),
           context.current.scroll, scrollClip, scrollBounds,
-          userScrollableHorizontal, userScrollableVertical, reasons);
+          userScrollableHorizontal, userScrollableVertical, reasons,
+          frameView.getScrollableArea());
     } else {
       if (frameView.scrollTranslation()) {
         // Ensure pre-existing properties are cleared if there is no scrolling.
         frameView.setScrollTranslation(nullptr);
         // Rebuild all descendant properties because a property was removed.
         context.forceSubtreeUpdate = true;
       }
     }
   }
 
@@ skipping 657 matching lines @@
     PaintPropertyTreeBuilderContext& context) {
   if (object.needsPaintPropertyUpdate() || context.forceSubtreeUpdate) {
     bool needsScrollProperties = false;
     if (object.hasOverflowClip()) {
       auto ancestorReasons =
           context.current.scroll->mainThreadScrollingReasons();
       auto reasons = mainThreadScrollingReasons(object, ancestorReasons);
       bool scrollNodeNeededForMainThreadReasons = ancestorReasons != reasons;
 
       const LayoutBox& box = toLayoutBox(object);
-      const auto* scrollableArea = box.getScrollableArea();
+      auto* scrollableArea = box.getScrollableArea();
       IntSize scrollOffset = box.scrolledContentOffset();
       if (scrollNodeNeededForMainThreadReasons || !scrollOffset.isZero() ||
           scrollableArea->scrollsOverflow()) {
         needsScrollProperties = true;
         auto& properties =
             object.getMutableForPainting().ensurePaintProperties();
 
         IntSize scrollClip = scrollableArea->visibleContentRect().size();
         IntSize scrollBounds = scrollableArea->contentsSize();
         bool userScrollableHorizontal =
@@ skipping 12 matching lines @@
         CompositorElementId compositorElementId =
             createDomNodeBasedCompositorElementId(object);
         TransformationMatrix matrix = TransformationMatrix().translate(
             -scrollOffset.width(), -scrollOffset.height());
         context.forceSubtreeUpdate |= properties.updateScrollTranslation(
             context.current.transform, matrix, FloatPoint3D(),
             context.current.shouldFlattenInheritedTransform,
             context.current.renderingContextId, CompositingReasonNone,
             compositorElementId, context.current.scroll, scrollClip,
             scrollBounds, userScrollableHorizontal, userScrollableVertical,
-            reasons);
+            reasons, scrollableArea);
       }
     }
 
     if (!needsScrollProperties) {
       // Ensure pre-existing properties are cleared.
       if (auto* properties = object.getMutableForPainting().paintProperties())
         context.forceSubtreeUpdate |= properties->clearScrollTranslation();
     }
   }
 
@@ skipping 185 matching lines @@
   updateOverflowClip(object, context);
   updatePerspective(object, context);
   updateSvgLocalToBorderBoxTransform(object, context);
   updateScrollAndScrollTranslation(object, context);
   updateOutOfFlowContext(object, context);
 
   context.forceSubtreeUpdate |= object.subtreeNeedsPaintPropertyUpdate();
 }
 
 }  // namespace blink