Deleted custom parsing code now that it has all moved to APIs.

This patch
- Deleted custom implementations of ParseSingleValue and ParseShorthand
  since all the properties handled here have been implemented in
  property APIs.
- Added default implementation to generated CSSProprtyAPI header instead
- Deleted CSSPropertyAPIBaseCustom.cpp as it was now empty.

Bug: 668012
Change-Id: Ib969064802eb2724556f1bfffc12761263d98081
Reviewed-on: https://chromium-review.googlesource.com/664457Reviewed-by: Jia Meng <jiameng@chromium.org>
Commit-Queue: Bugs Nash <bugsnash@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501547}

third_party/WebKit/Source/build/scripts/core/css/properties/templates/CSSPropertyAPI.h.tmpl

@@ -30,10 +30,13 @@ class CSSPropertyAPI {
 
   // Parses and consumes a longhand property value from the token range.
   // Returns nullptr if the input is invalid.
+  // TODO(bugsnash): remove CSSPropertyID arg from this and ParseShorthand
   virtual const CSSValue* ParseSingleValue(CSSPropertyID,
                                            CSSParserTokenRange&,
                                            const CSSParserContext&,
-                                           const CSSParserLocalContext&) const;
+                                           const CSSParserLocalContext&) const {
+    return nullptr;
+  }
   // Parses and consumes entire shorthand value from the token range and adds
   // all constituent parsed longhand properties to the 'properties' set.
   // Returns false if the input is invalid.
@@ -42,7 +45,9 @@ class CSSPropertyAPI {
                               CSSParserTokenRange&,
                               const CSSParserContext&,
                               const CSSParserLocalContext&,
-                              HeapVector<CSSProperty, 256>& properties) const;
+                              HeapVector<CSSProperty, 256>& properties) const {
+    return false;
+  }
 
   virtual bool IsInterpolable() const { return false; }
   virtual bool IsInherited() const { return false; }

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

@@ -421,7 +421,6 @@ blink_core_sources("css") {
     "properties/CSSPropertyAPIBackgroundColor.cpp",
     "properties/CSSPropertyAPIBackgroundOrMaskImage.cpp",
     "properties/CSSPropertyAPIBackgroundOrMaskSize.cpp",
-    "properties/CSSPropertyAPIBaseCustom.cpp",
     "properties/CSSPropertyAPIBaselineShift.cpp",
     "properties/CSSPropertyAPIBorderColor.cpp",
     "properties/CSSPropertyAPIBorderImageOutset.cpp",

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

-// Copyright 2017 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/properties/CSSPropertyAPI.h"
-
-#include "core/CSSPropertyNames.h"
-#include "core/StylePropertyShorthand.h"
-#include "core/css/CSSValue.h"
-#include "core/css/parser/CSSParserContext.h"
-#include "core/css/parser/CSSParserLocalContext.h"
-#include "core/css/parser/CSSPropertyParserHelpers.h"
-#include "core/css/properties/CSSPropertyAnimationTimingFunctionUtils.h"
-#include "core/css/properties/CSSPropertyBackgroundUtils.h"
-#include "core/css/properties/CSSPropertyBorderImageUtils.h"
-#include "core/css/properties/CSSPropertyBoxShadowUtils.h"
-#include "core/css/properties/CSSPropertyGridUtils.h"
-#include "core/css/properties/CSSPropertyLengthUtils.h"
-#include "core/css/properties/CSSPropertyMarginUtils.h"
-#include "core/css/properties/CSSPropertyPositionUtils.h"
-#include "core/css/properties/CSSPropertyTextDecorationLineUtils.h"
-#include "core/css/properties/CSSPropertyTransitionPropertyUtils.h"
-#include "platform/RuntimeEnabledFeatures.h"
-
-namespace blink {
-
-using namespace CSSPropertyParserHelpers;
-
-const CSSValue* CSSPropertyAPI::ParseSingleValue(
-    CSSPropertyID property,
-    CSSParserTokenRange& range,
-    const CSSParserContext& context,
-    const CSSParserLocalContext& local_context) const {
-  // This is the legacy ParseSingleValue code.
-  // TODO(bugsnash): Move all of this to individual CSSPropertyAPI subclasses.
-  return nullptr;
-}
-
-bool CSSPropertyAPI::ParseShorthand(
-    CSSPropertyID property,
-    bool important,
-    CSSParserTokenRange& range,
-    const CSSParserContext& context,
-    const CSSParserLocalContext& local_context,
-    HeapVector<CSSProperty, 256>& properties) const {
-  return false;
-}
-
-}  // namespace blink