Paint state transition for overlay 9 patch scrollbars

content/child/webthemeengine_impl_default.cc

Index: content/child/webthemeengine_impl_default.cc
diff --git a/content/child/webthemeengine_impl_default.cc b/content/child/webthemeengine_impl_default.cc
index b25a16742684aebe20b0fecb3295e821c05bfe31..4f78f1c9da21206899fe0e4d18a6d3d087657279 100644
--- a/content/child/webthemeengine_impl_default.cc
+++ b/content/child/webthemeengine_impl_default.cc
@@ -184,4 +184,19 @@ void WebThemeEngineImpl::paint(
       native_theme_extra_params);
 }
 
+void WebThemeEngineImpl::paintStateTransition(blink::WebCanvas* canvas,
+                                              WebThemeEngine::Part part,
+                                              WebThemeEngine::State startState,
+                                              WebThemeEngine::State endState,
+                                              double progress,
+                                              const blink::WebRect& rect) {
+  ui::NativeTheme::instance()->PaintStateTransition(
+      canvas,
+      NativeThemePart(part),
+      NativeThemeState(startState),
+      NativeThemeState(endState),
+      progress,
+      gfx::Rect(rect));
+}
+
 }  // namespace content