[ribbon] Add CSSProperty::GetCSSPropertyName.

This CL adds a function to get a CSSPropertyName from a CSSProperty.

Change-Id: I76f0a09367a082142dd38bc48f82200a630be527
Reviewed-on: https://chromium-review.googlesource.com/c/1429643Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625202}

third_party/blink/renderer/build/scripts/core/css/properties/templates/css_property.h.tmpl

@@ -9,6 +9,7 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PROPERTY_H_
 #define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PROPERTY_H_
 
+#include "third_party/blink/renderer/core/css/css_property_name.h"
 #include "third_party/blink/renderer/core/css/css_property_names.h"
 #include "third_party/blink/renderer/core/css/css_value.h"
 #include "third_party/blink/renderer/core/css/properties/css_unresolved_property.h"
@@ -44,6 +45,9 @@ class CSSProperty : public CSSUnresolvedProperty {
     NOTREACHED();
     return CSSPropertyInvalid;
   }
+  virtual CSSPropertyName GetCSSPropertyName() const {
+    return CSSPropertyName(PropertyID());
+  }
   bool IDEquals(CSSPropertyID id) const { return PropertyID() == id; }
   bool IsResolvedProperty() const override { return true; }
   virtual bool IsInterpolable() const { return false; }

third_party/blink/renderer/core/css/css_property_name_test.cc

@@ -4,6 +4,7 @@
 
 #include "third_party/blink/renderer/core/css/css_property_name.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/blink/renderer/core/css/properties/css_property.h"
 
 namespace blink {
 
@@ -47,4 +48,9 @@ TEST(CSSPropertyNameTest, From) {
   EXPECT_EQ(*CSSPropertyName::From("--x"), CSSPropertyName("--x"));
 }
 
+TEST(CSSPropertyNameTest, FromNativeCSSProperty) {
+  CSSPropertyName name = GetCSSPropertyFontSize().GetCSSPropertyName();
+  EXPECT_EQ(CSSPropertyName(CSSPropertyFontSize), name);
+}
+
 }  // namespace blink

third_party/blink/renderer/core/css/properties/longhands/custom_property.cc

@@ -30,6 +30,10 @@ const AtomicString& CustomProperty::GetPropertyNameAtomicString() const {
   return name_;
 }
 
+CSSPropertyName CustomProperty::GetCSSPropertyName() const {
+  return CSSPropertyName(name_);
+}
+
 void CustomProperty::ApplyInitial(StyleResolverState& state) const {
   state.Style()->RemoveVariable(name_, IsInherited());
 }

third_party/blink/renderer/core/css/properties/longhands/custom_property.h

@@ -30,6 +30,7 @@ class CORE_EXPORT CustomProperty : public Variable {
 
   bool IsInherited() const override;
   const AtomicString& GetPropertyNameAtomicString() const override;
+  CSSPropertyName GetCSSPropertyName() const override;
 
   void ApplyInitial(StyleResolverState&) const override;
   void ApplyInherit(StyleResolverState&) const override;

third_party/blink/renderer/core/css/properties/longhands/custom_property_test.cc

@@ -194,4 +194,9 @@ TEST_F(CustomPropertyTest, ParseSingleValueValidatedUntyped) {
   EXPECT_FALSE(value2);
 }
 
+TEST_F(CustomPropertyTest, GetCSSPropertyName) {
+  CustomProperty property("--x", GetDocument());
+  EXPECT_EQ(CSSPropertyName("--x"), property.GetCSSPropertyName());
+}
+
 }  // namespace blink

third_party/blink/renderer/core/css/properties/longhands/variable.h

@@ -22,6 +22,10 @@ class CORE_EXPORT Variable : public Longhand {
   bool IsInherited() const override { return true; }
   bool IsAffectedByAll() const override { return false; }
   CSSPropertyID PropertyID() const override { return CSSPropertyVariable; }
+  CSSPropertyName GetCSSPropertyName() const override {
+    NOTREACHED();
+    return CSSPropertyName("");
+  }
   const char* GetPropertyName() const override { return "variable"; }
   const WTF::AtomicString& GetPropertyNameAtomicString() const override {
     DEFINE_STATIC_LOCAL(const AtomicString, name, ("variable"));