Remove m_hasBlendMode from BeginTransparencyDisplayItem

Source/core/paint/LayerPainter.cpp

Index: Source/core/paint/LayerPainter.cpp
diff --git a/Source/core/paint/LayerPainter.cpp b/Source/core/paint/LayerPainter.cpp
index 97018dd72d245e7982eb5873e08a878200520a76..e0b248982f199afb03b2e82b170bb1051eabe5c4 100644
--- a/Source/core/paint/LayerPainter.cpp
+++ b/Source/core/paint/LayerPainter.cpp
@@ -106,6 +106,13 @@ void LayerPainter::paintLayer(GraphicsContext* context, const LayerPaintingInfo&
     paintLayerContentsAndReflection(context, paintingInfo, paintFlags);
 }
 
+static inline WebBlendMode blendModeForRenderer(const RenderObject& renderer)
+{
+    // RenderObject::hasBlendMode is gated on RuntimeEnabledFeatures::cssCompositingEnabled,
+    // otherwise the true-clause alone would suffice.
+    return renderer.hasBlendMode() ? renderer.style()->blendMode() : WebBlendModeNormal;

[Julien - ping for review, 2014/11/19 19:16:05]

RenderStyle::blendMode() is gated on cssCompositingEnabled too so you could just
use it directly and remove this function.

[chrishtr, 2014/11/19 19:24:09]

Let's get rid of all of the hasBlendMode() methods, and rename
WebBlendModeNormal to WebBlendModeNone.

[fs, 2014/11/20 09:09:46]

Ah, but of course... Thanks, fixed.

+}
+
 class TransparencyLayerHelper {
 public:
     TransparencyLayerHelper(GraphicsContext* context, RenderLayer& renderLayer, const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, const LayoutSize& subPixelAccumulation, PaintBehavior paintBehavior)
@@ -122,7 +129,7 @@ public:
 
         OwnPtr<BeginTransparencyDisplayItem> beginTransparencyDisplayItem = adoptPtr(new BeginTransparencyDisplayItem(
             renderLayer.renderer(), DisplayItem::BeginTransparency, renderLayer.paintingExtent(rootLayer, paintDirtyRect, subPixelAccumulation, paintBehavior),
-            renderLayer.renderer()->hasBlendMode(), renderLayer.renderer()->style()->blendMode(), renderLayer.renderer()->opacity()));
+            blendModeForRenderer(*renderLayer.renderer()), renderLayer.renderer()->opacity()));
         if (RuntimeEnabledFeatures::slimmingPaintEnabled())
             renderLayer.renderer()->view()->viewDisplayList().add(beginTransparencyDisplayItem.release());
         else