hasDescendantWithBlendMode should not be propagated outside the current stacking context.

Source/core/rendering/compositing/CompositingInputsUpdater.cpp

 // 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.
 
 #include "config.h"
 #include "core/rendering/compositing/CompositingInputsUpdater.h"
 
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/compositing/CompositedLayerMapping.h"
@@ skipping 156 matching lines @@
         info.hasAncestorWithClipOrOverflowClip = true;
 
     if (layer->renderer()->hasClipPath())
         info.hasAncestorWithClipPath = true;
 
     RenderLayer::DescendantDependentCompositingInputs descendantProperties;
     for (RenderLayer* child = layer->firstChild(); child; child = child->nextSibling()) {
         updateRecursive(child, updateType, info);
 
         descendantProperties.hasDescendantWithClipPath |= child->hasDescendantWithClipPath() || child->renderer()->hasClipPath();
-        descendantProperties.hasDescendantWithBlendMode |= child->hasDescendantWithBlendMode() || child->renderer()->hasBlendMode();
+        descendantProperties.hasNonIsolatedDescendantWithBlendMode |= (!child->stackingNode()->isStackingContext() && child->hasNonIsolatedDescendantWithBlendMode()) || child->renderer()->hasBlendMode();
     }
 
     layer->updateDescendantDependentCompositingInputs(descendantProperties);
     layer->didUpdateCompositingInputs();
 
     m_geometryMap.popMappingsToAncestor(layer->parent());
 }
 
 #if ENABLE(ASSERT)
 
 void CompositingInputsUpdater::assertNeedsCompositingInputsUpdateBitsCleared(RenderLayer* layer)
 {
     ASSERT(!layer->childNeedsCompositingInputsUpdate());
     ASSERT(!layer->needsCompositingInputsUpdate());
 
     for (RenderLayer* child = layer->firstChild(); child; child = child->nextSibling())
         assertNeedsCompositingInputsUpdateBitsCleared(child);
 }
 
 #endif
 
 } // namespace blink