Fix the position of context menu for BrowserPlugins inside OOPIF (Merge to M-57)

content/browser/browser_plugin/browser_plugin_guest.h

Index: content/browser/browser_plugin/browser_plugin_guest.h
diff --git a/content/browser/browser_plugin/browser_plugin_guest.h b/content/browser/browser_plugin/browser_plugin_guest.h
index 2b5a348aae7bdac542c4c0e285ac7aad92f61302..a057b4d3beea67f6397d0bf6d8691db974c3c3f6 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -258,6 +258,9 @@ class CONTENT_EXPORT BrowserPluginGuest : public GuestHost,
     return can_use_cross_process_frames_;
   }
 
+  gfx::Point GetCoordinatesInEmbedderWebContents(
+      const gfx::Point& relative_point);
+
  protected:
 
   // BrowserPluginGuest is a WebContentsObserver of |web_contents| and