Implement -webkit-box-reflect as a filter.

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 649 matching lines @@
       'graphics/UnacceleratedImageBufferSurface.cpp',
       'graphics/UnacceleratedImageBufferSurface.h',
       'graphics/compositing/PaintArtifactCompositor.cpp',
       'graphics/compositing/PaintArtifactCompositor.h',
       'graphics/cpu/arm/WebGLImageConversionNEON.h',
       'graphics/cpu/x86/WebGLImageConversionSSE.h',
       'graphics/filters/DistantLightSource.cpp',
       'graphics/filters/DistantLightSource.h',
       'graphics/filters/FEBlend.cpp',
       'graphics/filters/FEBlend.h',
+      'graphics/filters/FEBoxReflect.cpp',
+      'graphics/filters/FEBoxReflect.h',
       'graphics/filters/FEColorMatrix.cpp',
       'graphics/filters/FEColorMatrix.h',
       'graphics/filters/FEComponentTransfer.cpp',
       'graphics/filters/FEComponentTransfer.h',
       'graphics/filters/FEComposite.cpp',
       'graphics/filters/FEComposite.h',
       'graphics/filters/FEConvolveMatrix.cpp',
       'graphics/filters/FEConvolveMatrix.h',
       'graphics/filters/FEDiffuseLighting.cpp',
       'graphics/filters/FEDiffuseLighting.h',
@@ skipping 603 matching lines @@
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
           ],
         }
       ],
     ],
   },
 }