Allow callers of CommandLine::Init to know whether they were the first caller.

base/command_line_unittest.cc

 // 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.
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 273 matching lines @@
   CommandLine::StringType program_string(cl_program_path.GetProgram().value());
   EXPECT_EQ('"', cmd_string[0]);
   EXPECT_EQ(program_string, cmd_string.substr(1, program_string.length()));
   EXPECT_EQ('"', cmd_string[program_string.length() + 1]);
 }
 #endif
 
 // Calling Init multiple times should not modify the previous CommandLine.
 TEST(CommandLineTest, Init) {
   CommandLine* initial = CommandLine::ForCurrentProcess();
-  CommandLine::Init(0, NULL);
+  EXPECT_FALSE(CommandLine::Init(0, NULL));
   CommandLine* current = CommandLine::ForCurrentProcess();
   EXPECT_EQ(initial, current);
 }