MD History: update (instead of re-create) data sources on sign in change

content/browser/webui/web_ui_data_source_impl.cc

 // Copyright (c) 2012 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 "content/browser/webui/web_ui_data_source_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
@@ skipping 17 matching lines @@
 WebUIDataSource* WebUIDataSource::Create(const std::string& source_name) {
   return new WebUIDataSourceImpl(source_name);
 }
 
 // static
 void WebUIDataSource::Add(BrowserContext* browser_context,
                           WebUIDataSource* source) {
   URLDataManager::AddWebUIDataSource(browser_context, source);
 }
 
+// static
+void WebUIDataSource::Update(BrowserContext* browser_context,
+                             const std::string& source_name,
+                             std::unique_ptr<base::DictionaryValue> update) {
+  URLDataManager::UpdateWebUIDataSource(browser_context, source_name,
+                                        std::move(update));
+}
+
 // Internal class to hide the fact that WebUIDataSourceImpl implements
 // URLDataSource.
 class WebUIDataSourceImpl::InternalDataSource : public URLDataSource {
  public:
   explicit InternalDataSource(WebUIDataSourceImpl* parent) : parent_(parent) {}
 
   ~InternalDataSource() override {}
 
   // URLDataSource implementation.
   std::string GetSource() const override { return parent_->GetSource(); }
@@ skipping 121 matching lines @@
 }
 
 void WebUIDataSourceImpl::DisableReplaceExistingSource() {
   replace_existing_source_ = false;
 }
 
 void WebUIDataSourceImpl::ExcludePathFromGzip(const std::string& path) {
   excluded_paths_.insert(path);
 }
 
+bool WebUIDataSourceImpl::IsWebUIDataSourceImpl() const {
+  return true;
+}
+
 void WebUIDataSourceImpl::DisableContentSecurityPolicy() {
   add_csp_ = false;
 }
 
 void WebUIDataSourceImpl::OverrideContentSecurityPolicyObjectSrc(
     const std::string& data) {
   object_src_set_ = true;
   object_src_ = data;
 }
 
@@ skipping 85 matching lines @@
 }
 
 void WebUIDataSourceImpl::SendLocalizedStringsAsJSON(
     const URLDataSource::GotDataCallback& callback) {
   std::string template_data;
   webui::AppendJsonJS(&localized_strings_, &template_data);
   callback.Run(base::RefCountedString::TakeString(&template_data));
 }
 
 }  // namespace content