Add update available icon in system tray

chrome/browser/ui/ash/system_tray_client.h

Index: chrome/browser/ui/ash/system_tray_client.h
diff --git a/chrome/browser/ui/ash/system_tray_client.h b/chrome/browser/ui/ash/system_tray_client.h
index 355d046f6c3651240b481be4a4580ea01de37984..c21559abd1f1b2c301c53581828475e6383bd3bb 100644
--- a/chrome/browser/ui/ash/system_tray_client.h
+++ b/chrome/browser/ui/ash/system_tray_client.h
@@ -8,9 +8,11 @@
 #include "ash/public/interfaces/system_tray.mojom.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/system/system_clock_observer.h"
+#include "chromeos/dbus/update_engine_client.h"
 #include "components/policy/core/common/cloud/cloud_policy_store.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace ash {
@@ -64,6 +66,7 @@ class SystemTrayClient : public ash::mojom::SystemTrayClient,
                                   bool paired,
                                   bool connected) override;
   void ShowDateSettings() override;
+  void ShowAboutChromeOS() override;
   void ShowSetTimeDialog() override;
   void ShowDisplaySettings() override;
   void ShowPowerSettings() override;
@@ -83,6 +86,7 @@ class SystemTrayClient : public ash::mojom::SystemTrayClient,
   void ShowProxySettings() override;
   void SignOut() override;
   void RequestRestartForUpdate() override;
+  void ScheduleRequestUpdateCheck() override;
 
  private:
   // Helper function shared by ShowNetworkSettings() and ShowNetworkConfigure().
@@ -92,6 +96,9 @@ class SystemTrayClient : public ash::mojom::SystemTrayClient,
   // Requests that ash show the update available icon.
   void HandleUpdateAvailable();
 
+  // Requests that ash show the update over cellular available icon.
+  void HandleUpdateOverCellularAvailable();
+
   // chromeos::system::SystemClockObserver:
   void OnSystemClockChanged(chromeos::system::SystemClock* clock) override;
 
@@ -101,6 +108,12 @@ class SystemTrayClient : public ash::mojom::SystemTrayClient,
 
   void UpdateEnterpriseDomain();
 
+  // Attempts to check for update;
+  void RequestUpdateCheck();
+
+  void OnRequestUpdateCheck(
+      chromeos::UpdateEngineClient::UpdateCheckResult result);
+
   // content::NotificationObserver:
   void Observe(int type,
                const content::NotificationSource& source,