Restart Chrome if per session flags have been specified on ChromeOS.

chrome/browser/about_flags.h

Index: chrome/browser/about_flags.h
diff --git a/chrome/browser/about_flags.h b/chrome/browser/about_flags.h
index 2553425ac1e779e1eba8ed41f01803727bad00db..5d67e97277b03f45201be9ec544d5f0b5ff4256a 100644
--- a/chrome/browser/about_flags.h
+++ b/chrome/browser/about_flags.h
@@ -110,6 +110,11 @@ struct Experiment {
 void ConvertFlagsToSwitches(FlagsStorage* flags_storage,
                             CommandLine* command_line);
 
+// Compares a set of switches of the two provided command line objects and
+// returns true if they are the same and false otherwise.
+bool AreSwitchesIdenticalToCurrentCommandLine(
+    const CommandLine& new_cmdline, const CommandLine& active_cmdline);
+
 // Differentiate between generic flags available on a per session base and flags
 // that influence the whole machine and can be said by the admin only. This flag
 // is relevant for ChromeOS for now only and dictates whether entries marked