[SPv2] Add CSS mix-blend-mode support

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 681 matching lines @@
       // If the child is composited, but not a stacking context, it may paint
       // negative z-index descendants into an ancestor's GraphicsLayer.
       m_isAllScrollingContentComposited = false;
       return;
     }
   }
 }
 
 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;
   if (layoutObject()->style()->visibility() == EVisibility::Visible) {
     m_hasVisibleContent = true;
   } else {
     // layer may be hidden but still have some visible content, check for this
     m_hasVisibleContent = false;
     LayoutObject* r = layoutObject()->slowFirstChild();
@@ skipping 2542 matching lines @@
 }
 
 void showLayerTree(const blink::LayoutObject* layoutObject) {
   if (!layoutObject) {
     LOG(INFO) << "Cannot showLayerTree. Root is (nil)";
     return;
   }
   showLayerTree(layoutObject->enclosingLayer());
 }
 #endif