Reland PaintChunk::id

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 1198 matching lines @@
       'graphics/RecordingImageBufferSurfaceTest.cpp',
       'graphics/compositing/PaintArtifactCompositorTest.cpp',
       'graphics/filters/FilterOperationsTest.cpp',
       'graphics/filters/ImageFilterBuilderTest.cpp',
       'graphics/gpu/DrawingBufferTest.cpp',
       'graphics/paint/DisplayItemClientTest.cpp',
       'graphics/paint/DisplayItemListTest.cpp',
       'graphics/paint/DisplayItemTest.cpp',
       'graphics/paint/GeometryMapperTest.cpp',
       'graphics/paint/PaintArtifactToSkCanvasTest.cpp',
+      'graphics/paint/PaintChunkTest.cpp',
       'graphics/paint/PaintChunkerTest.cpp',
       'graphics/paint/PaintControllerTest.cpp',
       'graphics/paint/PropertyTreeStateTest.cpp',
       'image-decoders/FastSharedBufferReaderTest.cpp',
       'image-decoders/ImageDecoderTest.cpp',
       'image-decoders/ImageDecoderTestHelpers.cpp',
       'image-decoders/ImageDecoderTestHelpers.h',
       'image-decoders/bmp/BMPImageDecoderTest.cpp',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
@@ skipping 118 matching lines @@
       ['use_default_render_theme==1',
         {
           'platform_test_files': [
             'scroll/ScrollbarThemeAuraTest.cpp',
           ],
         }
       ],
     ],
   },
 }