Implements CSSPropertyAPI for the margin properties.

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

Index: third_party/WebKit/Source/core/css/BUILD.gn
diff --git a/third_party/WebKit/Source/core/css/BUILD.gn b/third_party/WebKit/Source/core/css/BUILD.gn
index eb1453218105c7a531284d7b528ba2f29623fd87..de74c26a8249c7019100a581713e7badd4c587e8 100644
--- a/third_party/WebKit/Source/core/css/BUILD.gn
+++ b/third_party/WebKit/Source/core/css/BUILD.gn
@@ -371,6 +371,7 @@ blink_core_sources("css") {
     "properties/CSSPropertyAPIImageOrientation.cpp",
     "properties/CSSPropertyAPIJustifyItems.cpp",
     "properties/CSSPropertyAPILetterAndWordSpacing.cpp",
+    "properties/CSSPropertyAPIMargin.cpp",
     "properties/CSSPropertyAPIOffsetPosition.cpp",
     "properties/CSSPropertyAPIOpacity.cpp",
     "properties/CSSPropertyAPIOrder.cpp",
@@ -407,6 +408,7 @@ blink_core_sources("css") {
     "properties/CSSPropertyAPIWebkitFontSizeDelta.cpp",
     "properties/CSSPropertyAPIWebkitHighlight.cpp",
     "properties/CSSPropertyAPIWebkitLineClamp.cpp",
+    "properties/CSSPropertyAPIWebkitMargin.cpp",
     "properties/CSSPropertyAPIWebkitMaxLogicalWidthOrHeight.cpp",
     "properties/CSSPropertyAPIWebkitPadding.cpp",
     "properties/CSSPropertyAPIWebkitTextEmphasisStyle.cpp",