[Layout API] Introduce Layout API shim and use in LayerClipRecorderTest.cpp

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 482 matching lines @@
             'svg/SVGZoomEvent.idl',
         ],
         # IDL files that only have typedefs/enums.
         'core_typedefs_enums_only_idl_files': [
             'dom/CommonDefinitions.idl',
             'timing/DOMHighResTimeStamp.idl',
             'timing/PerformanceEntryList.idl',
         ],
         'webcore_rendering_files': [
             'layout/api/HitTestAction.h',
+            'layout/api/LayoutAPIShim.h',
             'layout/api/LayoutBlockItem.h',
             'layout/api/LayoutBoxItem.h',
             'layout/api/LayoutBoxModel.h',
             'layout/api/LayoutEmbeddedItem.h',
             'layout/api/LayoutFullScreenItem.h',
             'layout/api/LayoutImageItem.h',
             'layout/api/LayoutItem.h',
             'layout/api/LayoutLIItem.h',
             'layout/api/LayoutMediaItem.h',
             'layout/api/LayoutMenuListItem.h',
@@ skipping 3640 matching lines @@
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'timing/PerformanceBaseTest.cpp',
             'timing/PerformanceObserverTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }