Add "customPropertiesApplied" metric to StyleResolverStats.

third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.cpp

 // Copyright 2015 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/resolver/CSSVariableResolver.h"
 
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
 #include "core/StyleBuilderFunctions.h"
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSPendingSubstitutionValue.h"
 #include "core/css/CSSUnsetValue.h"
 #include "core/css/CSSVariableData.h"
 #include "core/css/CSSVariableReferenceValue.h"
 #include "core/css/PropertyRegistry.h"
 #include "core/css/parser/CSSParserToken.h"
 #include "core/css/parser/CSSParserTokenRange.h"
 #include "core/css/parser/CSSPropertyParser.h"
 #include "core/css/resolver/StyleBuilder.h"
 #include "core/css/resolver/StyleBuilderConverter.h"
 #include "core/css/resolver/StyleResolverState.h"
+#include "core/css/resolver/StyleResolverStats.h"
+#include "core/dom/StyleEngine.h"
 #include "core/style/StyleInheritedVariables.h"
 #include "core/style/StyleNonInheritedVariables.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 bool CSSVariableResolver::resolveFallback(CSSParserTokenRange range,
                                           bool disallowAnimationTainted,
                                           Vector<CSSParserToken>& result,
                                           bool& resultIsAnimationTainted) {
@@ skipping 250 matching lines @@
 void CSSVariableResolver::resolveVariableDefinitions(
     const StyleResolverState& state) {
   StyleInheritedVariables* inheritedVariables =
       state.style()->inheritedVariables();
   StyleNonInheritedVariables* nonInheritedVariables =
       state.style()->nonInheritedVariables();
   if (!inheritedVariables && !nonInheritedVariables)
     return;
 
   CSSVariableResolver resolver(state);
+  int variableCount = 0;
   if (inheritedVariables) {
     for (auto& variable : inheritedVariables->m_data)
       resolver.valueForCustomProperty(variable.key);
+    variableCount += inheritedVariables->m_data.size();
   }
   if (nonInheritedVariables) {
     for (auto& variable : nonInheritedVariables->m_data)
       resolver.valueForCustomProperty(variable.key);
+    variableCount += nonInheritedVariables->m_data.size();
   }
+  INCREMENT_STYLE_STATS_COUNTER(state.document().styleEngine(),
+                                customPropertiesApplied, variableCount);
 }
 
 void CSSVariableResolver::computeRegisteredVariables(
     const StyleResolverState& state) {
   // const_cast is needed because Persistent<const ...> doesn't work properly.
 
   StyleInheritedVariables* inheritedVariables =
       state.style()->inheritedVariables();
   if (inheritedVariables) {
     for (auto& variable : inheritedVariables->m_registeredData) {
@@ skipping 17 matching lines @@
     }
   }
 }
 
 CSSVariableResolver::CSSVariableResolver(const StyleResolverState& state)
     : m_inheritedVariables(state.style()->inheritedVariables()),
       m_nonInheritedVariables(state.style()->nonInheritedVariables()),
       m_registry(state.document().propertyRegistry()) {}
 
 }  // namespace blink