Adding a comment to explain a return value.

chrome/browser/profiles/profile_info_cache.h

Index: chrome/browser/profiles/profile_info_cache.h
===================================================================
--- chrome/browser/profiles/profile_info_cache.h	(revision 127980)
+++ chrome/browser/profiles/profile_info_cache.h	(working copy)
@@ -55,6 +55,9 @@
   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;