Adding a comment to explain a return value.

chrome/browser/profiles/profile_info_cache.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_INFO_CACHE_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_INFO_CACHE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 37 matching lines @@
   virtual size_t GetNumberOfProfiles() const OVERRIDE;
   // Don't cache this value and reuse, because resorting the menu could cause
   // the item being referred to to change out from under you.
   virtual size_t GetIndexOfProfileWithPath(
       const FilePath& profile_path) const OVERRIDE;
   virtual string16 GetNameOfProfileAtIndex(size_t index) const OVERRIDE;
   virtual FilePath GetPathOfProfileAtIndex(size_t index) const OVERRIDE;
   virtual string16 GetUserNameOfProfileAtIndex(size_t index) const OVERRIDE;
   virtual const gfx::Image& GetAvatarIconOfProfileAtIndex(
       size_t index) const OVERRIDE;
+  // Note that a return value of false could mean an error in collection or
+  // that there are currently no background apps running. However, the action
+  // which results is the same in both cases (thus far).
   virtual bool GetBackgroundStatusOfProfileAtIndex(
       size_t index) const OVERRIDE;
   virtual string16 GetGAIANameOfProfileAtIndex(size_t index) const OVERRIDE;
   virtual bool IsUsingGAIANameOfProfileAtIndex(size_t index) const OVERRIDE;
   // Returns the GAIA picture for the given profile. This may return NULL
   // if the profile does not have a GAIA picture or if the picture must be
   // loaded from disk.
   virtual const gfx::Image* GetGAIAPictureOfProfileAtIndex(
       size_t index) const OVERRIDE;
   virtual bool IsUsingGAIAPictureOfProfileAtIndex(
@@ skipping 93 matching lines @@
   // to be mutable.
   mutable std::map<std::string, gfx::Image*> gaia_pictures_;
   // Marks a gaia profile picture as loading. This prevents a picture from
   // loading multiple times.
   mutable std::map<std::string, bool> gaia_pictures_loading_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileInfoCache);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_INFO_CACHE_H_