Implements CSSPropertyAPI for -webkit-perspective/perspective

As part of Project Ribbon, separate the parsing logic for CSS
properties -webkit-perspective and perspective from
the parser into an API.

Bug: 668012
Signed-off-by: Rob Buis <rob.buis@samsung.com>
Change-Id: I504248e8561a9f97f741a5b5e3338b29d6caa395
Reviewed-on: https://chromium-review.googlesource.com/578213Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488440}

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

@@ -2004,7 +2004,8 @@
     },
     {
       name: "perspective",
-      api_class: "CSSPropertyAPIPerspective",
+      api_class: true,
+      api_methods: ["parseSingleValue"],
       converter: "ConvertPerspective",
       interpolable: true,
       field_template: "primitive",

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

@@ -375,27 +375,6 @@ static CSSValue* ConsumeFilter(CSSParserTokenRange& range,
   return list;
 }
 
-static CSSValue* ConsumePerspective(CSSParserTokenRange& range,
-                                    const CSSParserContext* context,
-                                    bool use_legacy_parsing) {
-  if (range.Peek().Id() == CSSValueNone)
-    return ConsumeIdent(range);
-  CSSPrimitiveValue* parsed_value =
-      ConsumeLength(range, context->Mode(), kValueRangeAll);
-  if (!parsed_value && use_legacy_parsing) {
-    double perspective;
-    if (!ConsumeNumberRaw(range, perspective))
-      return nullptr;
-    context->Count(WebFeature::kUnitlessPerspectiveInPerspectiveProperty);
-    parsed_value = CSSPrimitiveValue::Create(
-        perspective, CSSPrimitiveValue::UnitType::kPixels);
-  }
-  if (parsed_value &&
-      (parsed_value->IsCalculated() || parsed_value->GetDoubleValue() > 0))
-    return parsed_value;
-  return nullptr;
-}
-
 static CSSValue* ConsumeBackgroundBlendMode(CSSParserTokenRange& range) {
   CSSValueID id = range.Peek().Id();
   if (id == CSSValueNormal || id == CSSValueOverlay ||
@@ -1046,10 +1025,6 @@ const CSSValue* CSSPropertyParser::ParseSingleValue(
     case CSSPropertyR:
       return ConsumeLengthOrPercent(range_, kSVGAttributeMode, kValueRangeAll,
                                     UnitlessQuirk::kForbid);
-    case CSSPropertyPerspective:
-      return ConsumePerspective(
-          range_, context_,
-          unresolved_property == CSSPropertyAliasWebkitPerspective);
     case CSSPropertyBorderImageRepeat:
     case CSSPropertyWebkitMaskBoxImageRepeat:
       return CSSPropertyBorderImageUtils::ConsumeBorderImageRepeat(range_);

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPerspective.cpp

@@ -4,4 +4,34 @@
 
 #include "core/css/properties/CSSPropertyAPIPerspective.h"
 
-namespace blink {}  // namespace blink
+#include "core/css/parser/CSSParserContext.h"
+#include "core/css/parser/CSSParserLocalContext.h"
+#include "core/css/parser/CSSPropertyParserHelpers.h"
+#include "core/frame/UseCounter.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPIPerspective::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext& context,
+    const CSSParserLocalContext& localContext) {
+  if (range.Peek().Id() == CSSValueNone)
+    return CSSPropertyParserHelpers::ConsumeIdent(range);
+  CSSPrimitiveValue* parsed_value = CSSPropertyParserHelpers::ConsumeLength(
+      range, context.Mode(), kValueRangeAll);
+  bool use_legacy_parsing = localContext.UseAliasParsing();
+  if (!parsed_value && use_legacy_parsing) {
+    double perspective;
+    if (!CSSPropertyParserHelpers::ConsumeNumberRaw(range, perspective))
+      return nullptr;
+    context.Count(WebFeature::kUnitlessPerspectiveInPerspectiveProperty);
+    parsed_value = CSSPrimitiveValue::Create(
+        perspective, CSSPrimitiveValue::UnitType::kPixels);
+  }
+  if (parsed_value &&
+      (parsed_value->IsCalculated() || parsed_value->GetDoubleValue() > 0))
+    return parsed_value;
+  return nullptr;
+}
+
+}  // namespace blink