Fix plugin placeholder invalidation issue

components/plugins/renderer/webview_plugin.cc

Index: components/plugins/renderer/webview_plugin.cc
diff --git a/components/plugins/renderer/webview_plugin.cc b/components/plugins/renderer/webview_plugin.cc
index c8abe0bc001461cf4ccc183bfebadff2e50e7eb7..926a3ae0df74e7c0137f07bcc7bbe93aad353231 100644
--- a/components/plugins/renderer/webview_plugin.cc
+++ b/components/plugins/renderer/webview_plugin.cc
@@ -235,6 +235,11 @@ void WebViewPlugin::didChangeCursor(const WebCursorInfo& cursor) {
   current_cursor_ = cursor;
 }
 
+void WebViewPlugin::scheduleAnimation() {
+  if (container_)
+    container_->invalidate();
+}
+
 void WebViewPlugin::didClearWindowObject(WebLocalFrame* frame) {
   if (delegate_)
     delegate_->BindWebFrame(frame);