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

chrome/browser/about_flags_unittest.cc

Index: chrome/browser/about_flags_unittest.cc
diff --git a/chrome/browser/about_flags_unittest.cc b/chrome/browser/about_flags_unittest.cc
index 4251cffcec57e5c6dead1f20961b5d0a279441f2..fc099c9513c7c61f15e42002465c27188723a81b 100644
--- a/chrome/browser/about_flags_unittest.cc
+++ b/chrome/browser/about_flags_unittest.cc
@@ -221,6 +221,34 @@ TEST_F(AboutFlagsTest, ConvertFlagsToSwitches) {
   EXPECT_TRUE(command_line.HasSwitch(kSwitch1));
 }
 
+TEST_F(AboutFlagsTest, CompareSwitchesToCurrentCommandLine) {
+  SetExperimentEnabled(&prefs_, kFlags1, true);
+
+  CommandLine command_line(CommandLine::NO_PROGRAM);
+  command_line.AppendSwitch("foo");
+
+  CommandLine new_command_line(CommandLine::NO_PROGRAM);
+  ConvertFlagsToSwitches(&prefs_, &new_command_line);
+
+  EXPECT_FALSE(CompareSwitchesToCurrentCommandLine(new_command_line,
+                                                   command_line));
+
+  ConvertFlagsToSwitches(&prefs_, &command_line);
+
+  EXPECT_TRUE(CompareSwitchesToCurrentCommandLine(new_command_line,
+                                                  command_line));
+
+  // Now both have flags but different.
+  SetExperimentEnabled(&prefs_, kFlags1, false);
+  SetExperimentEnabled(&prefs_, kFlags2, true);
+
+  CommandLine another_command_line(CommandLine::NO_PROGRAM);
+  ConvertFlagsToSwitches(&prefs_, &another_command_line);
+
+  EXPECT_FALSE(CompareSwitchesToCurrentCommandLine(new_command_line,
+                                                   another_command_line));
+}
+
 TEST_F(AboutFlagsTest, RemoveFlagSwitches) {
   std::map<std::string, CommandLine::StringType> switch_list;
   switch_list[kSwitch1] = CommandLine::StringType();