Clear matched properties cache for theme color changes.

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 3634 matching lines @@
             'paint/LayerClipRecorderTest.cpp',
             'paint/TextPainterTest.cpp',
             'paint/ViewDisplayListTest.cpp',
             'rendering/RenderBlockTest.cpp',
             'rendering/RenderInlineTest.cpp',
             'rendering/RenderMultiColumnFlowThreadTest.cpp',
             'rendering/RenderOverflowTest.cpp',
             'rendering/RenderPartTest.cpp',
             'rendering/RenderTableCellTest.cpp',
             'rendering/RenderTableRowTest.cpp',
+            'rendering/RenderThemeTest.cpp',
             'rendering/RenderingTestHelper.cpp',
             'rendering/RenderingTestHelper.h',
             'rendering/shapes/BoxShapeTest.cpp',
             'rendering/style/OutlineValueTest.cpp',
             'rendering/style/RenderStyleTest.cpp',
             'rendering/style/SVGRenderStyleTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }