ppapi: PPB_VpnProvider: Implement permission check

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 5c6d4c53b49b2d19cb3dd73aef872dcce59320f0..7a61399c7d788336dfba16b3a9796183d0ef96da 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -587,6 +587,11 @@ class CONTENT_EXPORT ContentBrowserClient {
                                     bool private_api,
                                     const SocketPermissionRequest* params);
 
+  // Returns true if the "vpnProvider" permission is allowed from the given
+  // |browser_context| and |url|.
+  virtual bool IsPepperVpnProviderAPIAllowed(BrowserContext* browser_context,
+                                             const GURL& url);
+
   // Returns an implementation of a file selecition policy. Can return nullptr.
   virtual ui::SelectFilePolicy* CreateSelectFilePolicy(
       WebContents* web_contents);