Avoid calling the GetSystemMetrics API in the renderer process on Windows to get the scrollbar metr…

content/child/webthemeengine_impl_default.h

Index: content/child/webthemeengine_impl_default.h
diff --git a/content/child/webthemeengine_impl_default.h b/content/child/webthemeengine_impl_default.h
index b757d441b39955ccc186443de7f5bb69c89c3ce1..a05313aad986f701a1a2ca72459005b163e094ce 100644
--- a/content/child/webthemeengine_impl_default.h
+++ b/content/child/webthemeengine_impl_default.h
@@ -25,6 +25,14 @@ class WebThemeEngineImpl : public blink::WebThemeEngine {
                                     blink::WebThemeEngine::State endState,
                                     double progress,
                                     const blink::WebRect& rect);
+
+#if defined(OS_WIN)
+  // Caches the scrollbar metrics.
+  static void cacheScrollBarMetrics(int32 vertical_scroll_bar_width,
+                                    int32 horizontal_scroll_bar_height,
+                                    int32 vertical_arrow_bitmap_height,
+                                    int32 horizontal_arrow_bitmap_width);
+#endif
 };
 
 }  // namespace content