Intersection Observer first draft

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 56 matching lines @@
             'dom/DocumentType.idl',
             'dom/Element.idl',
             'dom/Float32Array.idl',
             'dom/Float64Array.idl',
             'dom/FrameRequestCallback.idl',
             'dom/IdleCallbackDeadline.idl',
             'dom/IdleRequestCallback.idl',
             'dom/Int16Array.idl',
             'dom/Int32Array.idl',
             'dom/Int8Array.idl',
+            'dom/IntersectionObserver.idl',
+            'dom/IntersectionObserverEntry.idl',
             'dom/Iterator.idl',
             'dom/MessageChannel.idl',
             'dom/MessagePort.idl',
             'dom/MutationObserver.idl',
             'dom/MutationRecord.idl',
             'dom/NamedNodeMap.idl',
             'dom/Node.idl',
             'dom/NodeFilter.idl',
             'dom/NodeIterator.idl',
             'dom/NodeList.idl',
@@ skipping 2227 matching lines @@
             'dom/IdleCallbackDeadline.cpp',
             'dom/IdleCallbackDeadline.h',
             'dom/IdleRequestCallback.h',
             'dom/IdTargetObserver.cpp',
             'dom/IdTargetObserver.h',
             'dom/IdTargetObserverRegistry.cpp',
             'dom/IdTargetObserverRegistry.h',
             'dom/IgnoreDestructiveWriteCountIncrementer.h',
             'dom/IncrementLoadEventDelayCount.cpp',
             'dom/IncrementLoadEventDelayCount.h',
+            'dom/IntersectionObserver.cpp',
+            'dom/IntersectionObserver.h',
+            'dom/IntersectionObserverEntry.cpp',
+            'dom/IntersectionObserverEntry.h',
             'dom/Iterator.h',
             'dom/LayoutTreeBuilder.cpp',
             'dom/LayoutTreeBuilder.h',
             'dom/LayoutTreeBuilderTraversal.cpp',
             'dom/LayoutTreeBuilderTraversal.h',
             'dom/LiveNodeList.cpp',
             'dom/LiveNodeList.h',
             'dom/LiveNodeListBase.cpp',
             'dom/LiveNodeListBase.h',
             'dom/MainThreadTaskRunner.cpp',
@@ skipping 1153 matching lines @@
             'svg/properties/SVGPropertyTearOff.cpp',
         ],
         'core_dictionary_idl_files': [
             'animation/KeyframeEffectOptions.idl',
             'animation/ComputedTimingProperties.idl',
             'css/FontFaceDescriptors.idl',
             'css/FontFaceSetLoadEventInit.idl',
             'css/MediaQueryListEventInit.idl',
             'dom/DOMPointInit.idl',
             'dom/ElementRegistrationOptions.idl',
+            'dom/IntersectionObserverInit.idl',
             'dom/MutationObserverInit.idl',
             'dom/shadow/ShadowRootInit.idl',
             'events/AnimationEventInit.idl',
             'events/AnimationPlayerEventInit.idl',
             'events/ApplicationCacheErrorEventInit.idl',
             'events/AutocompleteErrorEventInit.idl',
             'events/CompositionEventInit.idl',
             'events/CustomEventInit.idl',
             'events/DragEventInit.idl',
             'events/ErrorEventInit.idl',
@@ skipping 32 matching lines @@
             '<(blink_core_output_dir)/css/FontFaceDescriptors.cpp',
             '<(blink_core_output_dir)/css/FontFaceDescriptors.h',
             '<(blink_core_output_dir)/css/FontFaceSetLoadEventInit.cpp',
             '<(blink_core_output_dir)/css/FontFaceSetLoadEventInit.h',
             '<(blink_core_output_dir)/css/MediaQueryListEventInit.cpp',
             '<(blink_core_output_dir)/css/MediaQueryListEventInit.h',
             '<(blink_core_output_dir)/dom/DOMPointInit.cpp',
             '<(blink_core_output_dir)/dom/DOMPointInit.h',
             '<(blink_core_output_dir)/dom/ElementRegistrationOptions.cpp',
             '<(blink_core_output_dir)/dom/ElementRegistrationOptions.h',
+            '<(blink_core_output_dir)/dom/IntersectionObserverInit.cpp',
+            '<(blink_core_output_dir)/dom/IntersectionObserverInit.h',
             '<(blink_core_output_dir)/dom/MutationObserverInit.cpp',
             '<(blink_core_output_dir)/dom/MutationObserverInit.h',
             '<(blink_core_output_dir)/dom/shadow/ShadowRootInit.cpp',
             '<(blink_core_output_dir)/dom/shadow/ShadowRootInit.h',
             '<(blink_core_output_dir)/events/AnimationEventInit.cpp',
             '<(blink_core_output_dir)/events/AnimationEventInit.h',
             '<(blink_core_output_dir)/events/AnimationPlayerEventInit.cpp',
             '<(blink_core_output_dir)/events/AnimationPlayerEventInit.h',
             '<(blink_core_output_dir)/events/ApplicationCacheErrorEventInit.cpp',
             '<(blink_core_output_dir)/events/ApplicationCacheErrorEventInit.h',
@@ skipping 299 matching lines @@
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }