Remove document.rootScroller compositing clipping effects.

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 50 matching lines @@
 #include "core/layout/LayoutPart.h"
 #include "core/layout/LayoutTreeAsText.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/api/LayoutPartItem.h"
 #include "core/layout/api/LayoutViewItem.h"
 #include "core/layout/compositing/CompositedLayerMapping.h"
 #include "core/layout/compositing/PaintLayerCompositor.h"
 #include "core/layout/svg/LayoutSVGResourceClipper.h"
 #include "core/layout/svg/LayoutSVGRoot.h"
 #include "core/page/Page.h"
-#include "core/page/scrolling/RootScrollerController.h"
 #include "core/page/scrolling/ScrollingCoordinator.h"
 #include "core/paint/BoxReflectionUtils.h"
 #include "core/paint/FilterEffectBuilder.h"
 #include "core/paint/ObjectPaintInvalidator.h"
 #include "platform/LengthFunctions.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/FloatPoint3D.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/TransformState.h"
 #include "platform/graphics/CompositorFilterOperations.h"
@@ skipping 67 matching lines @@
       m_previousPaintResult(FullyPainted),
       m_needsPaintPhaseDescendantOutlines(false),
       m_previousPaintPhaseDescendantOutlinesWasEmpty(false),
       m_needsPaintPhaseFloat(false),
       m_previousPaintPhaseFloatWasEmpty(false),
       m_needsPaintPhaseDescendantBlockBackgrounds(false),
       m_previousPaintPhaseDescendantBlockBackgroundsWasEmpty(false),
       m_hasDescendantWithClipPath(false),
       m_hasNonIsolatedDescendantWithBlendMode(false),
       m_hasAncestorWithClipPath(false),
-      m_hasRootScrollerAsDescendant(false),
       m_selfPaintingStatusChanged(false),
       m_layoutObject(layoutObject),
       m_parent(0),
       m_previous(0),
       m_next(0),
       m_first(0),
       m_last(0),
       m_staticInlinePosition(0),
       m_staticBlockPosition(0),
       m_ancestorOverflowLayer(nullptr) {
@@ skipping 497 matching lines @@
   }
 }
 
 void PaintLayer::updateDescendantDependentFlags() {
   if (m_needsDescendantDependentFlagsUpdate) {
     bool oldHasNonIsolatedDescendantWithBlendMode =
         m_hasNonIsolatedDescendantWithBlendMode;
     m_hasVisibleDescendant = false;
     m_hasNonIsolatedDescendantWithBlendMode = false;
     m_hasDescendantWithClipPath = false;
-    m_hasRootScrollerAsDescendant = false;
 
     for (PaintLayer* child = firstChild(); child;
          child = child->nextSibling()) {
       child->updateDescendantDependentFlags();
 
       if (child->m_hasVisibleContent || child->m_hasVisibleDescendant)
         m_hasVisibleDescendant = true;
 
       m_hasNonIsolatedDescendantWithBlendMode |=
           (!child->stackingNode()->isStackingContext() &&
            child->hasNonIsolatedDescendantWithBlendMode()) ||
           child->layoutObject().styleRef().hasBlendMode();
 
       m_hasDescendantWithClipPath |= child->hasDescendantWithClipPath() ||
                                      child->layoutObject().hasClipPath();
-
-      m_hasRootScrollerAsDescendant |= child->hasRootScrollerAsDescendant() ||
-                                       (child ==
-                                        child->layoutObject()
-                                            .document()
-                                            .rootScrollerController()
-                                            .rootScrollerPaintLayer());
     }
 
     if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled() &&
         oldHasNonIsolatedDescendantWithBlendMode !=
             static_cast<bool>(m_hasNonIsolatedDescendantWithBlendMode))
       layoutObject().setNeedsPaintPropertyUpdate();
     m_needsDescendantDependentFlagsUpdate = false;
   }
 
   bool previouslyHasVisibleContent = m_hasVisibleContent;
@@ skipping 2522 matching lines @@
 }
 
 void showLayerTree(const blink::LayoutObject* layoutObject) {
   if (!layoutObject) {
     LOG(INFO) << "Cannot showLayerTree. Root is (nil)";
     return;
   }
   showLayerTree(layoutObject->enclosingLayer());
 }
 #endif