Mandoline: fix the crash when a remote subframe tries to access session storage.

components/html_viewer/html_widget.cc

 // Copyright 2015 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/html_viewer/html_widget.h"
 
 #include "base/command_line.h"
 #include "components/html_viewer/global_state.h"
 #include "components/html_viewer/ime_controller.h"
 #include "components/html_viewer/stats_collection_controller.h"
@@ skipping 53 matching lines @@
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   settings->setExperimentalWebGLEnabled(
       !command_line->HasSwitch(kDisableWebGLSwitch));
 }
 
 }  // namespace
 
 // HTMLWidgetRootRemote -------------------------------------------------------
 
 HTMLWidgetRootRemote::HTMLWidgetRootRemote()
-    : web_view_(blink::WebView::create(nullptr)) {
+    : web_view_(blink::WebView::create(this)) {
   ConfigureSettings(web_view_->settings());
 }
 
 HTMLWidgetRootRemote::~HTMLWidgetRootRemote() {}
 
+blink::WebStorageNamespace*
+HTMLWidgetRootRemote::createSessionStorageNamespace() {
+  return new WebStorageNamespaceImpl();
+}
+
+bool HTMLWidgetRootRemote::allowsBrokenNullLayerTreeView() const {
+  return true;
+}
+
 blink::WebWidget* HTMLWidgetRootRemote::GetWidget() {
   return web_view_;
 }
 
 void HTMLWidgetRootRemote::OnViewBoundsChanged(mus::View* view) {}
 
 // HTMLWidgetRootLocal --------------------------------------------------------
 
 HTMLWidgetRootLocal::CreateParams::CreateParams(mojo::ApplicationImpl* app,
                                                 GlobalState* global_state,
@@ skipping 127 matching lines @@
 
 void HTMLWidgetLocalRoot::didUpdateTextOfFocusedElementByNonUserInput() {
   ime_controller_->DidUpdateTextOfFocusedElementByNonUserInput();
 }
 
 void HTMLWidgetLocalRoot::showImeIfNeeded() {
   ime_controller_->ShowImeIfNeeded();
 }
 
 }  // namespace html_viewer