Add missing header files to GN files

third_party/WebKit/Source/core/dom/BUILD.gn

Index: third_party/WebKit/Source/core/dom/BUILD.gn
diff --git a/third_party/WebKit/Source/core/dom/BUILD.gn b/third_party/WebKit/Source/core/dom/BUILD.gn
index 75fe9a85ff4f71ded869d1f08fc84c6a22021b55..0869667e650a209b2a2ca55de9deb6005d19e563 100644
--- a/third_party/WebKit/Source/core/dom/BUILD.gn
+++ b/third_party/WebKit/Source/core/dom/BUILD.gn
@@ -13,16 +13,19 @@ blink_core_sources("dom") {
     "AnimationWorkletProxyClient.h",
     "Attr.cpp",
     "Attr.h",
+    "Attribute.h",
     "AttributeCollection.h",
     "CDATASection.cpp",
     "CDATASection.h",
     "CSSSelectorWatch.cpp",
     "CSSSelectorWatch.h",
     "CharacterData.cpp",
+    "CharacterData.h",
     "ChildFrameDisconnector.cpp",
     "ChildFrameDisconnector.h",
     "ChildListMutationScope.cpp",
     "ChildListMutationScope.h",
+    "ChildNode.h",
     "ChildNodeList.cpp",
     "ChildNodeList.h",
     "ClassCollection.cpp",
@@ -86,6 +89,7 @@ blink_core_sources("dom") {
     "DecodedDataDocumentParser.cpp",
     "DecodedDataDocumentParser.h",
     "Document.cpp",
+    "Document.h",
     "DocumentEncodingData.cpp",
     "DocumentEncodingData.h",
     "DocumentFragment.cpp",
@@ -134,6 +138,7 @@ blink_core_sources("dom") {
     "ElementVisibilityObserver.h",
     "EmptyNodeList.cpp",
     "EmptyNodeList.h",
+    "ExceptionCode.h",
     "ExecutionContext.cpp",
     "ExecutionContext.h",
     "ExecutionContextTask.h",
@@ -162,6 +167,7 @@ blink_core_sources("dom") {
     "IntersectionObservation.h",
     "IntersectionObserver.cpp",
     "IntersectionObserver.h",
+    "IntersectionObserverCallback.h",
     "IntersectionObserverController.cpp",
     "IntersectionObserverController.h",
     "IntersectionObserverEntry.cpp",
@@ -178,6 +184,7 @@ blink_core_sources("dom") {
     "MessageChannel.cpp",
     "MessageChannel.h",
     "MessagePort.cpp",
+    "MessagePort.h",
     "Modulator.cpp",
     "Modulator.h",
     "ModuleMap.cpp",
@@ -198,6 +205,7 @@ blink_core_sources("dom") {
     "NamedNodeMap.cpp",
     "NamedNodeMap.h",
     "Node.cpp",
+    "Node.h",
     "NodeChildRemovalTracker.cpp",
     "NodeChildRemovalTracker.h",
     "NodeComputedStyle.h",
@@ -208,6 +216,7 @@ blink_core_sources("dom") {
     "NodeIterator.h",
     "NodeIteratorBase.cpp",
     "NodeIteratorBase.h",
+    "NodeList.h",
     "NodeListsNodeData.cpp",
     "NodeListsNodeData.h",
     "NodeRareData.cpp",
@@ -228,10 +237,12 @@ blink_core_sources("dom") {
     "ProcessingInstruction.cpp",
     "ProcessingInstruction.h",
     "PseudoElement.cpp",
+    "PseudoElement.h",
     "PseudoElementData.h",
     "QualifiedName.cpp",
     "QualifiedName.h",
     "Range.cpp",
+    "Range.h",
     "RangeBoundaryPoint.h",
     "RawDataDocumentParser.h",
     "RemoteSecurityContext.cpp",
@@ -300,6 +311,7 @@ blink_core_sources("dom") {
     "TaskRunnerHelper.h",
     "TemplateContentDocumentFragment.h",
     "Text.cpp",
+    "Text.h",
     "TextLinkColors.cpp",
     "TextLinkColors.h",
     "ThrowOnDynamicMarkupInsertionCountIncrementer.h",