Don't coerce pointers to compositor layer mappings to booleans.

Source/web/LinkHighlight.cpp

Index: Source/web/LinkHighlight.cpp
diff --git a/Source/web/LinkHighlight.cpp b/Source/web/LinkHighlight.cpp
index 4f32739267b200111858fb60827d2639405447fc..ed6ba1f98c7dfb1ea166508ac455f611d8194926 100644
--- a/Source/web/LinkHighlight.cpp
+++ b/Source/web/LinkHighlight.cpp
@@ -131,7 +131,7 @@ RenderLayer* LinkHighlight::computeEnclosingCompositingLayer()
 
     if (!newGraphicsLayer->drawsContent()) {
         if (renderLayer->scrollableArea()->usesCompositedScrolling()) {
-            ASSERT(renderLayer->compositedLayerMapping() && renderLayer->compositedLayerMapping()->scrollingContentsLayer());
+            ASSERT(renderLayer->compositingState() == PaintsIntoOwnBacking && renderLayer->compositedLayerMapping()->scrollingContentsLayer());

[shawnsingh, 2013/11/12 09:55:50]

Can you please explain? I actually am not familiar with the role/function of
link highlights.

[Ian Vollick, 2013/11/14 04:12:47]

It's just that if the renderLayer uses composited scrolling, it'll totally paint
into its own backing.

             newGraphicsLayer = renderLayer->compositedLayerMapping()->scrollingContentsLayer();
         } else
             ASSERT_NOT_REACHED();