Plumbing blink::Interface{Provider|Registry} through WebLocalFrame's constructor.

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 <stddef.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 235 matching lines @@
 
 WebViewPlugin::WebViewHelper::WebViewHelper(
     WebViewPlugin* plugin,
     const WebPreferences& preferences) : plugin_(plugin) {
   web_view_ =
       WebView::create(this, blink::WebPageVisibilityStateVisible);
   // ApplyWebPreferences before making a WebLocalFrame so that the frame sees a
   // consistent view of our preferences.
   content::RenderView::ApplyWebPreferences(preferences, web_view_);
   WebLocalFrame* web_frame = WebLocalFrame::create(
-      blink::WebTreeScopeType::Document, this);
+      blink::WebTreeScopeType::Document, this, nullptr, nullptr);

[Łukasz Anforowicz, 2017/01/23 23:38:16]

WebViewPlugin::WebViewHelper doesn't override interface{Provider|Registry}, so
it just inherits the default implementation from blink::WebFrameClient which
used to return nullptr.

   web_view_->setMainFrame(web_frame);
   // TODO(dcheng): The main frame widget currently has a special case.
   // Eliminate this once WebView is no longer a WebWidget.
   WebFrameWidget::create(this, web_view_, web_frame);
 }
 
 WebViewPlugin::WebViewHelper::~WebViewHelper() {
   web_view_->close();
 }
 
@@ skipping 78 matching lines @@
   if (!delegate_)
     return;
 
   // The delegate may instantiate a new plugin.
   delegate_->OnUnobscuredRectUpdate(gfx::Rect(unobscured_rect));
   // The delegate may have dirtied style and layout of the WebView.
   // See for example the resizePoster function in plugin_poster.html.
   // Run the lifecycle now so that it is clean.
   web_view()->updateAllLifecyclePhases();
 }