Update comments in multiprocess_test.h & add an example.

base/multiprocess_test.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef BASE_MULTIPROCESS_TEST_H__
 #define BASE_MULTIPROCESS_TEST_H__
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/process_util.h"
 #include "base/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/multiprocess_func_list.h"
 #include "testing/platform_test.h"
 
 #if defined(OS_POSIX)
 #include <sys/types.h>
 #include <unistd.h>
 #endif
 
 // Command line switch to invoke a child process rather than
 // to run the normal test suite.
 static const wchar_t kRunClientProcess[] = L"client";
 
 // A MultiProcessTest is a test class which makes it easier to
 // write a test which requires code running out of process.
 //
 // To create a multiprocess test simply follow these steps:
 //
-// 1) Derive your test from MultiProcessTest.
+// 1) Derive your test from MultiProcessTest. Example:
+//
+//    class MyTest : public MultiProcessTest {
+//    };
+//
+//    TEST_F(MyTest, TestCaseName) {
+//      ...
+//    }
+//
 // 2) Create a mainline function for the child processes and include
 //    testing/multiprocess_func_list.h.
 //    See the declaration of the MULTIPROCESS_TEST_MAIN macro
 //    in that file for an example.
-// 3) Call SpawnChild("foo"), where "foo" is the name of
+// 3) Call SpawnChild(L"foo"), where "foo" is the name of
 //    the function you wish to run in the child processes.
 // That's it!
 //
 class MultiProcessTest : public PlatformTest {
  protected:
   // Run a child process.
   // 'procname' is the name of a function which the child will
   // execute.  It must be exported from this library in order to
   // run.
   //
@@ skipping 36 matching lines @@
     std::string switchstr = WideToUTF8(wswitchstr);
     clvec.push_back(switchstr.c_str());
     base::LaunchApp(clvec, false, &handle);
 #endif
 
     return handle;
   }
 };
 
 #endif  // BASE_MULTIPROCESS_TEST_H__