Add smooth interpolation support for <color> custom properties

third_party/WebKit/Source/core/css/CSSSyntaxDescriptor.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/CSSSyntaxDescriptor.h"
 
+#include "core/animation/CSSColorInterpolationType.h"
+#include "core/animation/CSSValueInterpolationType.h"
 #include "core/css/CSSCustomPropertyDeclaration.h"
 #include "core/css/CSSURIValue.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/CSSVariableReferenceValue.h"
 #include "core/css/parser/CSSParserContext.h"
 #include "core/css/parser/CSSParserIdioms.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 #include "core/css/parser/CSSVariableParser.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 
@@ skipping 186 matching lines @@
   }
   range.consumeWhitespace();
   for (const CSSSyntaxComponent& component : m_syntaxComponents) {
     if (const CSSValue* result = consumeSyntaxComponent(component, range))
       return result;
   }
   return CSSVariableParser::parseRegisteredPropertyValue(range, true,
                                                          isAnimationTainted);
 }
 
+InterpolationTypes CSSSyntaxDescriptor::createInterpolationTypes(
+    const AtomicString& propertyName) const {
+  PropertyHandle property(propertyName);
+  InterpolationTypes interpolationTypes;
+  for (const CSSSyntaxComponent& component : m_syntaxComponents) {
+    if (component.m_repeatable) {
+      // TODO(alancutter): Support animation of repeatable types.
+      continue;
+    }
+
+    switch (component.m_type) {
+      case CSSSyntaxType::Color:
+        interpolationTypes.append(
+            WTF::makeUnique<CSSColorInterpolationType>(property));
+        break;
+      case CSSSyntaxType::Length:
+      case CSSSyntaxType::Number:
+      case CSSSyntaxType::Percentage:
+      case CSSSyntaxType::LengthPercentage:
+      case CSSSyntaxType::Image:
+      case CSSSyntaxType::Url:
+      case CSSSyntaxType::Integer:
+      case CSSSyntaxType::Angle:
+      case CSSSyntaxType::Time:
+      case CSSSyntaxType::Resolution:
+      case CSSSyntaxType::TransformFunction:
+        // TODO(alancutter): Support smooth interpolation of these types.
+        break;
+      case CSSSyntaxType::TokenStream:
+      case CSSSyntaxType::Ident:
+      case CSSSyntaxType::CustomIdent:
+        // Uses the CSSValueInterpolationType added below.
+        break;
+      default:
+        NOTREACHED();
+        break;
+    }
+  }
+  interpolationTypes.append(
+      WTF::makeUnique<CSSValueInterpolationType>(property));
+  return interpolationTypes;
+}
+
 }  // namespace blink