MD History: Update sign in state in data source

chrome/browser/ui/webui/history_ui.cc

Index: chrome/browser/ui/webui/history_ui.cc
diff --git a/chrome/browser/ui/webui/history_ui.cc b/chrome/browser/ui/webui/history_ui.cc
index af647cee1d892e757c1c8f857a9cdca3b71c29c7..9d57fdfca4f0aff3b16e65d7f0babe2309617fb0 100644
--- a/chrome/browser/ui/webui/history_ui.cc
+++ b/chrome/browser/ui/webui/history_ui.cc
@@ -172,15 +172,22 @@ content::WebUIDataSource* CreateHistoryUIHTMLSource(Profile* profile) {
 
 }  // namespace
 
-HistoryUI::HistoryUI(content::WebUI* web_ui) : WebUIController(web_ui) {
+HistoryUI::HistoryUI(content::WebUI* web_ui)
+    : WebUIController(web_ui), weak_ptr_factory_(this) {
   web_ui->AddMessageHandler(new BrowsingHistoryHandler());
   web_ui->AddMessageHandler(new MetricsHandler());
 
+  Profile* profile = Profile::FromWebUI(web_ui);
+  data_source_ = CreateHistoryUIHTMLSource(profile);
+  // Set up the chrome://history-frame/ source.
+  content::WebUIDataSource::Add(profile, data_source_);
+
   // On mobile we deal with foreign sessions differently.
 #if !defined(OS_ANDROID)
   if (search::IsInstantExtendedAPIEnabled()) {
     web_ui->AddMessageHandler(new browser_sync::ForeignSessionHandler());
-    web_ui->AddMessageHandler(new HistoryLoginHandler());
+    web_ui->AddMessageHandler(new HistoryLoginHandler(
+        base::Bind(&HistoryUI::SignInChanged, weak_ptr_factory_.GetWeakPtr())));
   }
 #endif
 
@@ -197,10 +204,6 @@ HistoryUI::HistoryUI(content::WebUI* web_ui) : WebUIController(web_ui) {
     browsing_data::testing::
         g_override_other_forms_of_browsing_history_query = true;
   }
-
-  // Set up the chrome://history-frame/ source.
-  Profile* profile = Profile::FromWebUI(web_ui);
-  content::WebUIDataSource::Add(profile, CreateHistoryUIHTMLSource(profile));
 }
 
 HistoryUI::~HistoryUI() {}
@@ -211,3 +214,10 @@ base::RefCountedMemory* HistoryUI::GetFaviconResourceBytes(
   return ResourceBundle::GetSharedInstance().
       LoadDataResourceBytesForScale(IDR_HISTORY_FAVICON, scale_factor);
 }
+
+void HistoryUI::SignInChanged(bool signed_in) {
+  // Recreate the data source so sign in state get updated in there.
+  Profile* profile = Profile::FromWebUI(web_ui());
+  data_source_ = CreateHistoryUIHTMLSource(profile);
+  content::WebUIDataSource::Add(profile, data_source_);
+}