Display "Restart to update" dialog to Chrome OS users.

chrome/browser/ui/ash/system_tray_client.cc

Index: chrome/browser/ui/ash/system_tray_client.cc
diff --git a/chrome/browser/ui/ash/system_tray_client.cc b/chrome/browser/ui/ash/system_tray_client.cc
index b295cb24edcb1f42f007c0eade47f470e0b21505..3ba63486bf87faabfc45168ee356d61759451290 100644
--- a/chrome/browser/ui/ash/system_tray_client.cc
+++ b/chrome/browser/ui/ash/system_tray_client.cc
@@ -315,9 +315,9 @@ void SystemTrayClient::SignOut() {
   chrome::AttemptUserExit();
 }
 
-void SystemTrayClient::RequestRestartForUpdate() {
+void SystemTrayClient::RequestRestartForUpdate(bool always_reboot) {
   // We expect that UpdateEngine is in "Reboot for update" state now.
-  chrome::NotifyAndTerminate(true /* fast_path */);
+  chrome::NotifyAndTerminate(true /* fast_path */, always_reboot);

[James Cook, 2016/11/30 23:01:41]

For example, this could query
SystemTrayDelegateChromeOS::Get()->GetFlashUpdateAvailable(). (If you do that,
be sure to check that SystemTrayDelegateChromeOS::Get() is not null, for my
project there's a case where SystemTrayClient exists but SystemTrayDelegate does
not. This code is mid-refactor, sorry.)

Alternately, this object could store the flash_update_available_ boolean, but
you'd still need to call into SystemTrayDelegateChromeOS to trigger showing the
update UI.

 }
 
 ////////////////////////////////////////////////////////////////////////////////