GuestView: Show status bubbles in browser

extensions/browser/guest_view/guest_view_manager.h

Index: extensions/browser/guest_view/guest_view_manager.h
diff --git a/extensions/browser/guest_view/guest_view_manager.h b/extensions/browser/guest_view/guest_view_manager.h
index 0645379698ec439a6dcaf949a2fac9d9484109ce..a38dbb72aade3b4b9a282956b049ab12dff98de4 100644
--- a/extensions/browser/guest_view/guest_view_manager.h
+++ b/extensions/browser/guest_view/guest_view_manager.h
@@ -31,8 +31,15 @@ class GuestViewManager : public content::BrowserPluginGuestManager,
   explicit GuestViewManager(content::BrowserContext* context);
   ~GuestViewManager() override;
 
+  // Returns the GuestViewManager associated with |context|. If one isn't
+  // available, then it is created and returned.
   static GuestViewManager* FromBrowserContext(content::BrowserContext* context);
 
+  // Returns the GuestViewManager associated with |context|. If one isn't
+  // available, then nullptr is returned.
+  static GuestViewManager* FromBrowserContextIfAvailable(
+      content::BrowserContext* context);
+
   // Overrides factory for testing. Default (NULL) value indicates regular
   // (non-test) environment.
   static void set_factory_for_testing(GuestViewManagerFactory* factory) {