Implement ComputedStylePropertyMap for Typed OM.

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 403 matching lines @@
             'workers/SharedWorkerGlobalScope.idl',
             'workers/WorkerGlobalScope.idl',
             'workers/WorkerNavigator.idl',
         ],
         # 'partial interface', target (right side of) 'implements', and
         # interfaces with static bindings (in bindings/core/v8/)
         'core_dependency_idl_files': [
             'animation/DocumentAnimation.idl',
             'animation/ElementAnimation.idl',
             'css/DocumentFontFaceSet.idl',
+            'css/cssom/WindowGetComputedStyle.idl',
             'dom/ChildNode.idl',
             'dom/DocumentFullscreen.idl',
             'dom/DocumentOrShadowRoot.idl',
             'dom/ElementFullscreen.idl',
             'dom/GlobalEventHandlers.idl',
             'dom/NonDocumentTypeChildNode.idl',
             'dom/NonElementParentNode.idl',
             'dom/ParentNode.idl',
             'dom/URLUtilsReadOnly.idl',
             'events/EventListener.idl',
@@ skipping 915 matching lines @@
             'css/cssom/CSSRotation.cpp',
             'css/cssom/CSSRotation.h',
             'css/cssom/CSSScale.cpp',
             'css/cssom/CSSScale.h',
             'css/cssom/CSSSimpleLength.cpp',
             'css/cssom/CSSSimpleLength.h',
             'css/cssom/CSSSkew.cpp',
             'css/cssom/CSSSkew.h',
             'css/cssom/CSSTranslation.cpp',
             'css/cssom/CSSTranslation.h',
+            'css/cssom/ComputedStylePropertyMap.cpp',
+            'css/cssom/ComputedStylePropertyMap.h',
             'css/cssom/ImmutableStylePropertyMap.h',
             'css/cssom/InlineStylePropertyMap.cpp',
             'css/cssom/InlineStylePropertyMap.h',
             'css/cssom/MatrixTransformComponent.cpp',
             'css/cssom/MatrixTransformComponent.h',
             'css/cssom/MutableStylePropertyMap.h',
             'css/cssom/StylePropertyMap.cpp',
             'css/cssom/StylePropertyMap.h',
             'css/cssom/StyleValue.cpp',
             'css/cssom/StyleValue.h',
             'css/cssom/StyleValueFactory.cpp',
             'css/cssom/StyleValueFactory.h',
             'css/cssom/TransformComponent.h',
             'css/cssom/TransformValue.cpp',
             'css/cssom/TransformValue.h',
+            'css/cssom/WindowGetComputedStyle.h',
             'css/invalidation/InvalidationSet.cpp',
             'css/invalidation/InvalidationSet.h',
             'css/invalidation/PendingInvalidations.h',
             'css/invalidation/StyleInvalidator.cpp',
             'css/invalidation/StyleInvalidator.h',
             'css/invalidation/StyleSheetInvalidationAnalysis.cpp',
             'css/invalidation/StyleSheetInvalidationAnalysis.h',
             'css/parser/CSSAtRuleID.cpp',
             'css/parser/CSSAtRuleID.h',
             'css/parser/CSSParser.cpp',
@@ skipping 2774 matching lines @@
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'timing/PerformanceBaseTest.cpp',
             'timing/PerformanceObserverTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }