Implement empty WorkerInternals interface.

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 3822 matching lines @@
         'webcore_testing_idl_files': [
             'testing/DictionaryTest.idl',
             'testing/GCObservation.idl',
             'testing/GarbageCollectedScriptWrappable.idl',
             'testing/InternalSettings.idl',
             'testing/LayerRect.idl',
             'testing/LayerRectList.idl',
             'testing/PrivateScriptTest.idl',
             'testing/TypeConversions.idl',
             'testing/UnionTypesTest.idl',
+            'testing/WorkerInternals.idl',
         ],
         # testing IDL files that have partial interfaces in modules.
         'webcore_testing_idl_with_modules_dependency_files': [
             'testing/Internals.idl',
         ],
         'webcore_testing_dependency_idl_files': [
             'origin_trials/testing/InternalsFrobulate.idl',
             'testing/PartialPrivateScriptTest.idl',
         ],
         'generated_webcore_testing_idl_files': [
@@ skipping 28 matching lines @@
             'testing/LayerRectList.h',
             'testing/NullExecutionContext.cpp',
             'testing/NullExecutionContext.h',
             'testing/PrivateScriptTest.cpp',
             'testing/PrivateScriptTest.h',
             'testing/TypeConversions.h',
             'testing/UnionTypesTest.cpp',
             'testing/UnionTypesTest.h',
             'testing/v8/WebCoreTestSupport.cpp',
             'testing/v8/WebCoreTestSupport.h',
+            'testing/WorkerInternals.cpp',
+            'testing/WorkerInternals.h',
         ],
         'core_unittest_files': [
             'animation/AnimationClockTest.cpp',
             'animation/AnimationInputHelpersTest.cpp',
             'animation/AnimationEffectTest.cpp',
             'animation/AnimationTest.cpp',
             'animation/AnimationStackTest.cpp',
             'animation/KeyframeEffectTest.cpp',
             'animation/AnimationTestHelper.cpp',
             'animation/AnimationTestHelper.h',
@@ skipping 216 matching lines @@
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }