Clear matched properties cache for theme color changes.

Source/core/dom/StyleEngine.cpp

Index: Source/core/dom/StyleEngine.cpp
diff --git a/Source/core/dom/StyleEngine.cpp b/Source/core/dom/StyleEngine.cpp
index 031c0a6fffc89a0590ca5b85933e95f1a38d7b7d..7eb4911738fc3d96b175fb3d95066ca38e92a56b 100644
--- a/Source/core/dom/StyleEngine.cpp
+++ b/Source/core/dom/StyleEngine.cpp
@@ -673,6 +673,13 @@ void StyleEngine::fontsNeedUpdate(CSSFontSelector*)
     document().setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::Fonts));
 }
 
+void StyleEngine::platformColorsChanged()
+{
+    if (m_resolver)
+        m_resolver->invalidateMatchedPropertiesCache();
+    document().setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::PlatformColorChange));
+}
+
 void StyleEngine::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)