Update to Chromium revision 248478.

- Add new CefSettings.windowless_rendering_enabled value that must be enabled when using windowless (off-screen) rendering.
- Improve naming and documentation for CefWindowInfo members.
- CefBeginTracing now completes asynchronously.
- Rename CefEndTracingAsync to CefEndTracing.
- Rename CefCompletionHandler to CefCompletionCallback.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1592 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_context_impl.cc

@@ -267,6 +267,19 @@ void CefBrowserContextImpl::CancelMIDISysExPermissionRequest(
     const GURL& requesting_frame) {
 }
 
+void CefBrowserContextImpl::RequestProtectedMediaIdentifierPermission(
+    int render_process_id,
+    int render_view_id,
+    int bridge_id,
+    int group_id,
+    const GURL& requesting_frame,
+    const ProtectedMediaIdentifierPermissionCallback& callback) {
+}
+
+void CefBrowserContextImpl::CancelProtectedMediaIdentifierPermissionRequests(
+      int group_id) {
+}
+
 content::ResourceContext* CefBrowserContextImpl::GetResourceContext() {
   return resource_context_.get();
 }