Implement -webkit-box-reflect as a filter.

third_party/WebKit/Source/core/paint/FilterEffectBuilder.cpp

Index: third_party/WebKit/Source/core/paint/FilterEffectBuilder.cpp
diff --git a/third_party/WebKit/Source/core/paint/FilterEffectBuilder.cpp b/third_party/WebKit/Source/core/paint/FilterEffectBuilder.cpp
index 1a6666f38dd4f774970996147bbe2e3064f3305f..7a5b74dd8e1960cadd1b7b50b43000ac24abcc15 100644
--- a/third_party/WebKit/Source/core/paint/FilterEffectBuilder.cpp
+++ b/third_party/WebKit/Source/core/paint/FilterEffectBuilder.cpp
@@ -31,6 +31,7 @@
 #include "platform/FloatConversion.h"
 #include "platform/LengthFunctions.h"
 #include "platform/graphics/ColorSpace.h"
+#include "platform/graphics/filters/FEBoxReflect.h"
 #include "platform/graphics/filters/FEColorMatrix.h"
 #include "platform/graphics/filters/FEComponentTransfer.h"
 #include "platform/graphics/filters/FEDropShadow.h"
@@ -228,6 +229,11 @@ bool FilterEffectBuilder::build(Element* element, const FilterOperations& operat
             effect = FEDropShadow::create(parentFilter.get(), stdDeviation, stdDeviation, x, y, dropShadowOperation->getColor(), 1);
             break;
         }
+        case FilterOperation::BOX_REFLECT: {
+            BoxReflectFilterOperation* boxReflectOperation = toBoxReflectFilterOperation(filterOperation);
+            effect = FEBoxReflect::create(parentFilter.get(), boxReflectOperation->direction(), boxReflectOperation->offset());
+            break;
+        }
         default:
             break;
         }