DevTools: allow injecting CSS rules without breaking styles sidebar.

Source/core/inspector/InspectorStyleSheet.h

Index: Source/core/inspector/InspectorStyleSheet.h
diff --git a/Source/core/inspector/InspectorStyleSheet.h b/Source/core/inspector/InspectorStyleSheet.h
index adc3d857238723a4b596fdd373daf65612673ebc..11ddbe5ec2aa2e514d39497f38ec649f71412b87 100644
--- a/Source/core/inspector/InspectorStyleSheet.h
+++ b/Source/core/inspector/InspectorStyleSheet.h
@@ -151,14 +151,14 @@ private:
     RefPtrWillBeRawPtr<CSSRuleSourceData> ruleAfterSourceRange(const SourceRange&);
     RefPtrWillBeRawPtr<CSSRuleSourceData> findRuleByHeaderRange(const SourceRange&);
     RefPtrWillBeRawPtr<CSSRuleSourceData> findRuleByBodyRange(const SourceRange&);
-    RefPtrWillBeRawPtr<CSSRule> ruleForSourceData(CSSRuleSourceData*);
-    RefPtrWillBeRawPtr<CSSRuleSourceData> sourceDataForRule(CSSRule*);
+    RefPtrWillBeRawPtr<CSSRule> ruleForSourceData(RefPtrWillBeRawPtr<CSSRuleSourceData>);
+    RefPtrWillBeRawPtr<CSSRuleSourceData> sourceDataForRule(RefPtrWillBeRawPtr<CSSRule>);
     CSSStyleRule* insertCSSOMRuleInStyleSheet(CSSRule* insertBefore, const String& ruleText, ExceptionState&);
     CSSStyleRule* insertCSSOMRuleInMediaRule(CSSMediaRule*, CSSRule* insertBefore, const String& ruleText, ExceptionState&);
     CSSStyleRule* insertCSSOMRuleBySourceRange(const SourceRange&, const String& ruleText, ExceptionState&);
     String sourceMapURL();
     String sourceURL();
-    void collectFlatRules();
+    void mapSourceDataToCSSOM();
     bool resourceStyleSheetText(String* result);
     bool inlineStyleSheetText(String* result);
     PassRefPtr<TypeBuilder::Array<TypeBuilder::CSS::Selector>> selectorsFromSource(CSSRuleSourceData*, const String&);
@@ -167,8 +167,8 @@ private:
     bool hasSourceURL();
     bool startsAtZero();
 
-    void replaceText(const SourceRange&, const String& text, SourceRange* newRange, String* oldText);
-    void innerSetText(const String& newText, bool markAsLocallyModified);
+    bool replaceText(const SourceRange&, const String& text, SourceRange* newRange, String* oldText);
+    bool innerSetText(const String& newText, bool markAsLocallyModified);
     Element* ownerStyleElement();
 
     RawPtrWillBeMember<InspectorCSSAgent> m_cssAgent;
@@ -177,8 +177,12 @@ private:
     TypeBuilder::CSS::StyleSheetOrigin::Enum m_origin;
     String m_documentURL;
     OwnPtrWillBeMember<RuleSourceDataList> m_sourceData;
+    RefPtrWillBeMember<CSSStyleSheet> m_sourceDataSheet;
     String m_text;
     CSSRuleVector m_flatRules;
+    typedef HashMap<unsigned, unsigned, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned>> IndexMap;
+    IndexMap m_ruleToSourceData;
+    IndexMap m_sourceDataToRule;
     String m_sourceURL;
 };