arc: Reactivate OptIn flow on clicking Play Store.

chrome/browser/chromeos/arc/arc_session_manager.h

Index: chrome/browser/chromeos/arc/arc_session_manager.h
diff --git a/chrome/browser/chromeos/arc/arc_session_manager.h b/chrome/browser/chromeos/arc/arc_session_manager.h
index 1f23796bd658fec2b60fe15f2af47d4bd0373831..cfd26dbd189b0b9e2f651959e8d4a5f10b559f5c 100644
--- a/chrome/browser/chromeos/arc/arc_session_manager.h
+++ b/chrome/browser/chromeos/arc/arc_session_manager.h
@@ -216,6 +216,9 @@ class ArcSessionManager : public ArcSessionRunner::Observer,
   // been started yet.
   base::Time arc_start_time() const { return arc_start_time_; }
 
+  // Returns true if ARC requested to start.
+  bool enable_requested() const { return enable_requested_; }
+
   // Injectors for testing.
   void SetArcSessionRunnerForTesting(
       std::unique_ptr<ArcSessionRunner> arc_session_runner);