Set needsLayout on WebViewPlugin's container when initialized

components/plugins/renderer/webview_plugin.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/plugins/renderer/webview_plugin.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/numerics/safe_conversions.h"
 #include "content/public/common/web_preferences.h"
@@ skipping 94 matching lines @@
 void WebViewPlugin::RestoreTitleText() {
   if (container_)
     container_->element().setAttribute("title", old_title_);
 }
 
 WebPluginContainer* WebViewPlugin::container() const { return container_; }
 
 bool WebViewPlugin::initialize(WebPluginContainer* container) {
   container_ = container;
   if (container_) {
+    // We must call layout again here to ensure that the container is laid
+    // out before we next try to paint it, which is a requirement of the
+    // document life cycle in Blink. In most cases, needsLayout is set by
+    // scheduleAnimation, but due to timers controlling widget update,
+    // scheduleAnimation may be invoked before this initialize call (which
+    // comes through the widget update process). It doesn't hurt to mark
+    // for layout again, and it does help us in the race-condition situation.
+    container_->setNeedsLayout();
+
     old_title_ = container_->element().getAttribute("title");
 
     // Propagate device scale to inner webview to load the correct resource
     // when images have a "srcset" attribute.
     web_view_->setDeviceScaleFactor(container_->deviceScaleFactor());
   }
   return true;
 }
 
 void WebViewPlugin::destroy() {
@@ skipping 154 matching lines @@
 
   global->Set(gin::StringToV8(isolate, "plugin"),
               delegate_->GetV8Handle(isolate));
 }
 
 void WebViewPlugin::didReceiveResponse(WebLocalFrame* frame,
                                        unsigned identifier,
                                        const WebURLResponse& response) {
   WebFrameClient::didReceiveResponse(frame, identifier, response);
 }