ImageBuffer-less SVG masking and clipping.

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index 33b0a7d59868918592247dba36eda2808b7ef5ac..45dd5850e4b2e1b25fb32774b2095ae144ac14be 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -3674,6 +3674,7 @@ void RenderLayer::paintLayerContents(GraphicsContext* context, const LayerPainti
     // Apply clip-path to context.
     bool hasClipPath = false;
     RenderStyle* style = renderer()->style();
+    RenderSVGResourceClipper* resourceClipper = 0;
     if (renderer()->hasClipPath() && !context->paintingDisabled() && style) {
         ASSERT(style->clipPath());
         if (style->clipPath()->getOperationType() == ClipPathOperation::SHAPE) {
@@ -3699,7 +3700,11 @@ void RenderLayer::paintLayerContents(GraphicsContext* context, const LayerPainti
                 }
 
                 // FIXME: This should use a safer cast such as toRenderSVGResourceContainer().
-                static_cast<RenderSVGResourceClipper*>(element->renderer())->applyClippingToContext(renderer(), rootRelativeBounds, paintingInfo.paintDirtyRect, context);
+                resourceClipper = static_cast<RenderSVGResourceClipper*>(element->renderer());
+                if (!resourceClipper->applyClippingToContext(renderer(), rootRelativeBounds, paintingInfo.paintDirtyRect, context)) {
+                    // No need to post-apply the clipper if this failed.
+                    resourceClipper = 0;
+                }
             }
         }
     }
@@ -3825,6 +3830,9 @@ void RenderLayer::paintLayerContents(GraphicsContext* context, const LayerPainti
         m_usedTransparency = false;
     }
 
+    if (resourceClipper)
+        resourceClipper->postApplyResource(renderer(), context, ApplyToDefaultMode, 0, 0);
+
     if (hasClipPath)
         context->restore();
 }