Generate enum/getters/setters/mappings for user-select.

Currently, the user-select property is a 'storage_only' field,
so it has no generated public getters/setters. This patch changes it to
a 'keyword' field so that its getters/setters can be generated as well.
We also generate the EUserSelect enum and use the generated
CSSValueID <-> EUserSelect mappings.

Diff of generated files:
https://gist.github.com/darrnshn/55f9abda5310dd37a0b60386f23e0e4a/revisions

BUG=628043

Review-Url: https://codereview.chromium.org/2911963004
Cr-Commit-Position: refs/heads/master@{#475867}

third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h

@@ -1214,41 +1214,6 @@ inline EUserModify CSSIdentifierValue::ConvertTo() const {
   return EUserModify::kReadOnly;
 }
 
-template <>
-inline CSSIdentifierValue::CSSIdentifierValue(EUserSelect e)
-    : CSSValue(kIdentifierClass) {
-  switch (e) {
-    case EUserSelect::kNone:
-      value_id_ = CSSValueNone;
-      break;
-    case EUserSelect::kText:
-      value_id_ = CSSValueText;
-      break;
-    case EUserSelect::kAll:
-      value_id_ = CSSValueAll;
-      break;
-  }
-}
-
-template <>
-inline EUserSelect CSSIdentifierValue::ConvertTo() const {
-  switch (value_id_) {
-    case CSSValueAuto:
-      return EUserSelect::kText;
-    case CSSValueNone:
-      return EUserSelect::kNone;
-    case CSSValueText:
-      return EUserSelect::kText;
-    case CSSValueAll:
-      return EUserSelect::kAll;
-    default:
-      break;
-  }
-
-  NOTREACHED();
-  return EUserSelect::kText;
-}
-
 template <>
 inline CSSIdentifierValue::CSSIdentifierValue(EVerticalAlign a)
     : CSSValue(kIdentifierClass) {

third_party/WebKit/Source/core/css/CSSProperties.json5

@@ -2699,10 +2699,9 @@
     {
       name: "user-select",
       inherited: true,
-      field_template: "storage_only",
-      type_name: "EUserSelect",
-      default_value: "EUserSelect::kText",
-      field_size: 2,
+      field_template: "keyword",
+      keywords: ["none", "text", "all"],
+      default_value: "text",
       field_group: "rare-inherited",
     },
     {

third_party/WebKit/Source/core/css/CSSValueIDMappings.h

@@ -83,6 +83,13 @@ inline EDisplay CssValueIDToPlatformEnum(CSSValueID v) {
   return detail::cssValueIDToPlatformEnumGenerated<EDisplay>(v);
 }
 
+template <>
+inline EUserSelect CssValueIDToPlatformEnum(CSSValueID v) {
+  if (v == CSSValueAuto)
+    return EUserSelect::kText;
+  return detail::cssValueIDToPlatformEnumGenerated<EUserSelect>(v);
+}
+
 }  // namespace blink
 
 #endif

third_party/WebKit/Source/core/style/ComputedStyle.h

@@ -1765,15 +1765,6 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase<ComputedStyle>,
     SET_VAR(rare_inherited_data_, user_modify_, static_cast<unsigned>(u));
   }
 
-  // -webkit-user-select
-  static EUserSelect InitialUserSelect() { return EUserSelect::kText; }
-  EUserSelect UserSelect() const {
-    return static_cast<EUserSelect>(rare_inherited_data_->user_select_);
-  }
-  void SetUserSelect(EUserSelect s) {
-    SET_VAR(rare_inherited_data_, user_select_, static_cast<unsigned>(s));
-  }
-
   // caret-color
   void SetCaretColor(const StyleAutoColor& color) {
     SET_VAR(rare_inherited_data_, caret_color_, color.Resolve(Color()));

third_party/WebKit/Source/core/style/ComputedStyleConstants.h

@@ -181,10 +181,6 @@ enum class EUserModify { kReadOnly, kReadWrite, kReadWritePlaintextOnly };
 
 enum EUserDrag { DRAG_AUTO, DRAG_NONE, DRAG_ELEMENT };
 
-// CSS3 User Select Values
-
-enum class EUserSelect { kNone, kText, kAll };
-
 // CSS3 Image Values
 enum ObjectFit {
   kObjectFitFill,