| // 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. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_RESOLVER_STYLE_RULE_USAGE_TRACKER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_RESOLVER_STYLE_RULE_USAGE_TRACKER_H_ |
| |
| #include "third_party/blink/renderer/core/css/css_style_rule.h" |
| |
| namespace blink { |
| |
| class StyleRule; |
| |
| class StyleRuleUsageTracker : public GarbageCollected<StyleRuleUsageTracker> { |
| public: |
| using RuleListByStyleSheet = HeapHashMap<Member<const CSSStyleSheet>, |
| HeapVector<Member<const StyleRule>>>; |
| |
| void Track(const CSSStyleSheet*, const StyleRule*); |
| RuleListByStyleSheet TakeDelta(); |
| |
| void Trace(blink::Visitor*); |
| |
| private: |
| HeapHashSet<std::pair<Member<const CSSStyleSheet>, Member<const StyleRule>>> |
| used_rules_; |
| RuleListByStyleSheet used_rules_delta_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_RESOLVER_STYLE_RULE_USAGE_TRACKER_H_ |