Added IsPublicSession utility function to profiles_state

chrome/browser/profiles/profiles_state.cc

Index: chrome/browser/profiles/profiles_state.cc
diff --git a/chrome/browser/profiles/profiles_state.cc b/chrome/browser/profiles/profiles_state.cc
index 268c5dfd1e58ed89c7d660ffc8dd45e4f23cba87..005c922adf028df6b252cb0a7e880f8e8b5a3d5d 100644
--- a/chrome/browser/profiles/profiles_state.cc
+++ b/chrome/browser/profiles/profiles_state.cc
@@ -34,6 +34,10 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/text_elider.h"
 
+#if defined(OS_CHROMEOS)
+#include "chromeos/login/login_state.h"
+#endif
+
 namespace profiles {
 
 bool IsMultipleProfilesEnabled() {
@@ -279,4 +283,13 @@ bool AreAllNonChildNonSupervisedProfilesLocked() {
   return at_least_one_regular_profile_present;
 }
 
+bool IsPublicSession() {
+#if defined(OS_CHROMEOS)
+  if (chromeos::LoginState::IsInitialized()) {
+    return chromeos::LoginState::Get()->IsPublicSessionUser();
+  }
+#endif
+  return false;
+}
+
 }  // namespace profiles