Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

Source/platform/blink_platform.gypi

 {
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.cpp',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
       'Clock.h',
       'ColorChooser.cpp',
@@ skipping 546 matching lines @@
       'graphics/CrossfadeGeneratedImage.cpp',
       'graphics/CrossfadeGeneratedImage.h',
       'graphics/DecodingImageGenerator.cpp',
       'graphics/DecodingImageGenerator.h',
       'graphics/DeferredImageDecoder.cpp',
       'graphics/DeferredImageDecoder.h',
       'graphics/DiscardablePixelRef.cpp',
       'graphics/DiscardablePixelRef.h',
       'graphics/DisplayList.cpp',
       'graphics/DisplayList.h',
-      'graphics/DrawLooper.cpp',
-      'graphics/DrawLooper.h',
+      'graphics/DrawLooperBuilder.cpp',
+      'graphics/DrawLooperBuilder.h',
       'graphics/FrameData.cpp',
       'graphics/FrameData.h',
       'graphics/GeneratedImage.cpp',
       'graphics/GeneratedImage.h',
       'graphics/Gradient.cpp',
       'graphics/Gradient.h',
       'graphics/GradientGeneratedImage.cpp',
       'graphics/GradientGeneratedImage.h',
       'graphics/GraphicsContext.cpp',
       'graphics/GraphicsContext.h',
@@ skipping 334 matching lines @@
     # NOTE: these are legacy unit tests, do not add more!
     'platform_web_unittest_files': [
       'animation/TimingFunctionTest.cpp',
       'graphics/DeferredImageDecoderTest.cpp',
       'graphics/ImageDecodingStoreTest.cpp',
       'graphics/ImageFrameGeneratorTest.cpp',
       'graphics/test/MockImageDecoder.h',
     ],
   },
 }