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

chrome/browser/component_updater/pepper_flash_component_installer.cc

Index: chrome/browser/component_updater/pepper_flash_component_installer.cc
diff --git a/chrome/browser/component_updater/pepper_flash_component_installer.cc b/chrome/browser/component_updater/pepper_flash_component_installer.cc
index c525686f20be3af3f2a86d6674026ca388944468..0e73f96e79442239e1d44dde5fc35be76b4d4ebd 100644
--- a/chrome/browser/component_updater/pepper_flash_component_installer.cc
+++ b/chrome/browser/component_updater/pepper_flash_component_installer.cc
@@ -44,6 +44,7 @@
 #include "ppapi/shared_impl/ppapi_permissions.h"
 
 #if defined(OS_CHROMEOS)
+#include "chrome/browser/ui/ash/system_tray_delegate_chromeos.h"
 #include "chromeos/dbus/dbus_method_call_status.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/image_loader_client.h"
@@ -73,8 +74,15 @@ void LogRegistrationResult(chromeos::DBusMethodCallStatus call_status,
     LOG(ERROR) << "Call to imageloader service failed.";
     return;
   }
-  if (!result)
+  if (!result) {
     LOG(ERROR) << "Component flash registration failed";
+    return;
+  }
+  chromeos::SystemTrayDelegateChromeOS* tray =
+      chromeos::SystemTrayDelegateChromeOS::Get();
+  if (tray) {
+    tray->SetFlashUpdateAvailable();

[waffles, 2016/11/17 00:39:56]

As an FYI, the updater uses a lot of CONTINUE_ON_SHUTDOWN, so we can wind up
calling this pretty late in the browser's destruction. As long as this is only
run on the UI thread I think this should be safe.

[Greg K, 2016/11/30 19:30:29]

Acknowledged.

+  }
 }
 
 void ImageLoaderRegistration(const std::string& version,