Add missing header files to GN files

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

Index: third_party/WebKit/Source/core/layout/BUILD.gn
diff --git a/third_party/WebKit/Source/core/layout/BUILD.gn b/third_party/WebKit/Source/core/layout/BUILD.gn
index 7896fcc6da983e0828c78a761f3505c26a24c00d..464cfeb62b8339f5db2f812fe21bb5126804cbe0 100644
--- a/third_party/WebKit/Source/core/layout/BUILD.gn
+++ b/third_party/WebKit/Source/core/layout/BUILD.gn
@@ -40,6 +40,7 @@ blink_core_sources("layout") {
     "HitTestLocation.h",
     "HitTestRequest.h",
     "HitTestResult.cpp",
+    "HitTestResult.h",
     "HitTestingTransformState.cpp",
     "HitTestingTransformState.h",
     "ImageQualityController.cpp",
@@ -49,11 +50,14 @@ blink_core_sources("layout") {
     "LayoutAnalyzer.cpp",
     "LayoutAnalyzer.h",
     "LayoutBR.cpp",
+    "LayoutBR.h",
     "LayoutBlock.cpp",
     "LayoutBlock.h",
     "LayoutBlockFlow.cpp",
+    "LayoutBlockFlow.h",
     "LayoutBlockFlowLine.cpp",
     "LayoutBox.cpp",
+    "LayoutBox.h",
     "LayoutBoxModelObject.cpp",
     "LayoutBoxModelObject.h",
     "LayoutButton.cpp",
@@ -114,6 +118,7 @@ blink_core_sources("layout") {
     "LayoutMultiColumnSpannerPlaceholder.cpp",
     "LayoutMultiColumnSpannerPlaceholder.h",
     "LayoutObject.cpp",
+    "LayoutObject.h",
     "LayoutObjectChildList.cpp",
     "LayoutObjectChildList.h",
     "LayoutObjectInlines.h",
@@ -166,6 +171,7 @@ blink_core_sources("layout") {
     "LayoutTableSection.cpp",
     "LayoutTableSection.h",
     "LayoutText.cpp",
+    "LayoutText.h",
     "LayoutTextCombine.cpp",
     "LayoutTextCombine.h",
     "LayoutTextControl.cpp",
@@ -189,6 +195,7 @@ blink_core_sources("layout") {
     "LayoutThemeMobile.cpp",
     "LayoutThemeMobile.h",
     "LayoutTreeAsText.cpp",
+    "LayoutTreeAsText.h",
     "LayoutVTTCue.cpp",
     "LayoutVTTCue.h",
     "LayoutVideo.cpp",
@@ -293,9 +300,12 @@ blink_core_sources("layout") {
     "line/EllipsisBox.h",
     "line/GlyphOverflow.h",
     "line/InlineBox.cpp",
+    "line/InlineBox.h",
     "line/InlineFlowBox.cpp",
+    "line/InlineFlowBox.h",
     "line/InlineIterator.h",
     "line/InlineTextBox.cpp",
+    "line/InlineTextBox.h",
     "line/LayoutTextInfo.h",
     "line/LineBoxList.cpp",
     "line/LineBoxList.h",
@@ -306,6 +316,7 @@ blink_core_sources("layout") {
     "line/LineWidth.cpp",
     "line/LineWidth.h",
     "line/RootInlineBox.cpp",
+    "line/RootInlineBox.h",
     "line/TrailingObjects.cpp",
     "line/TrailingObjects.h",
     "line/WordMeasurement.h",