Expose WorkerPool to blink

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 908 matching lines @@
       'text/TextRun.cpp',
       'text/TextRun.h',
       'text/TextRunIterator.h',
       'text/TextStream.cpp',
       'text/TextStream.h',
       'text/UnicodeBidi.h',
       'text/UnicodeRange.cpp',
       'text/UnicodeRange.h',
       'text/UnicodeUtilities.cpp',
       'text/UnicodeUtilities.h',
+      'threading/BackgroundTaskRunner.cpp',
+      'threading/BackgroundTaskRunner.h',      
       'transforms/AffineTransform.cpp',
       'transforms/AffineTransform.h',
       'transforms/IdentityTransformOperation.h',
       'transforms/InterpolatedTransformOperation.cpp',
       'transforms/InterpolatedTransformOperation.h',
       'transforms/Matrix3DTransformOperation.cpp',
       'transforms/Matrix3DTransformOperation.h',
       'transforms/MatrixTransformOperation.cpp',
       'transforms/MatrixTransformOperation.h',
       'transforms/PerspectiveTransformOperation.cpp',
@@ skipping 127 matching lines @@
       'graphics/ImageDecodingStoreTest.cpp',
       'graphics/ImageFrameGeneratorTest.cpp',
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/test/MockImageDecoder.h',
       'graphics/test/MockWebGraphicsContext3D.h',
       'image-decoders/ImageDecoderTestHelpers.cpp',
       'image-decoders/bmp/BMPImageDecoderTest.cpp',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
+      'threading/BackgroundTaskRunnerTest.cpp',
     ],
     # TODO(jbroman): Move these into platform_test_support_files.
     'platform_unittest_support_files': [
       'testing/URLTestHelpers.cpp',
       'testing/URLTestHelpers.h',
       'testing/UnitTestHelpers.cpp',
       'testing/UnitTestHelpers.h',
     ],
     'platform_test_support_files': [
       'graphics/test/FakeGraphicsLayerFactory.cpp',
@@ skipping 32 matching lines @@
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
           ],
         }
       ],
     ],
   },
 }