Handling of scrollbar arrow size between for Aura-on-Windows

webkit/glue/webthemeengine_impl_win.cc

Index: webkit/glue/webthemeengine_impl_win.cc
diff --git a/webkit/glue/webthemeengine_impl_win.cc b/webkit/glue/webthemeengine_impl_win.cc
index 30464e08bc48a14b44f1ad3ccc0f8a75a0ace88c..7e60501664819408c5bb177f8718dea67986b8fc 100644
--- a/webkit/glue/webthemeengine_impl_win.cc
+++ b/webkit/glue/webthemeengine_impl_win.cc
@@ -15,6 +15,7 @@
 using WebKit::WebCanvas;
 using WebKit::WebColor;
 using WebKit::WebRect;
+using WebKit::WebSize;
 
 namespace webkit_glue {
 
@@ -981,4 +982,19 @@ void WebThemeEngineImpl::paintProgressBar(
                                       extra);
 }
 
+WebSize WebThemeEngineImpl::getSize(int part) {
+  switch (part) {
+    case SBP_ARROWBTN: {
+      gfx::Size size = ui::NativeTheme::instance()->GetPartSize(
+          ui::NativeTheme::kScrollbarUpArrow,
+          ui::NativeTheme::kNormal,
+          ui::NativeTheme::ExtraParams());
+      return WebSize(size.width(), size.height());
+    }
+    default:
+      NOTREACHED() << "Unhandled part: " << part;
+  }
+  return WebSize();
+}
+
 }  // namespace webkit_glue