DevTools: allow injecting CSS rules without breaking styles sidebar.

Source/core/css/parser/CSSParser.h

 // Copyright 2014 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 CSSParser_h
 #define CSSParser_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
 #include "core/css/CSSValue.h"
@@ skipping 35 matching lines @@
     static PassRefPtrWillBeRawPtr<StyleRuleKeyframe> parseKeyframeRule(const CSSParserContext&, const String&);
 
     static bool parseSupportsCondition(const String&);
 
     // The color will only be changed when string contains a valid CSS color, so callers
     // can set it to a default color and ignore the boolean result.
     static bool parseColor(RGBA32& color, const String&, bool strict = false);
     static bool parseSystemColor(RGBA32& color, const String&);
     static StyleColor colorFromRGBColorString(const String&);
 
-    static void parseSheetForInspector(const CSSParserContext&, const String&, CSSParserObserver&);
+    static void parseSheetForInspector(const CSSParserContext&, StyleSheetContents*, const String&, CSSParserObserver&);

[pfeldman, 2015/06/25 17:52:32]

@timloh: I now need StyleSheetContents* as a result of this. What do you want me
to do to this signature? Should it be merged with parseSheet and get a nullable
observer?

     static void parseDeclarationListForInspector(const CSSParserContext&, const String&, CSSParserObserver&);
 
 private:
     static bool parseValue(MutableStylePropertySet*, CSSPropertyID unresolvedProperty, const String&, bool important, const CSSParserContext&);
 };
 
 // TODO(timloh): It's weird that these are declared here but defined in CSSPropertyParser.h
 CSSPropertyID unresolvedCSSPropertyID(const String&);
 CSSPropertyID cssPropertyID(const String&);
 
 } // namespace blink
 
 #endif // CSSParser_h