GTTF: Extract a function to launch child gtest process.

base/test/test_launcher.h

Index: base/test/test_launcher.h
diff --git a/base/test/test_launcher.h b/base/test/test_launcher.h
index 866b7720cc51ce0ef82d1724cd9209ffd62cc95b..603179c1f0035da0ac515a3ec900859f1a801aa3 100644
--- a/base/test/test_launcher.h
+++ b/base/test/test_launcher.h
@@ -12,6 +12,8 @@
 #include "base/compiler_specific.h"
 #include "base/time.h"
 
+class CommandLine;
+
 namespace testing {
 class TestCase;
 class TestInfo;
@@ -70,6 +72,10 @@ class TestLauncherDelegate {
   virtual ~TestLauncherDelegate();
 };
 
+int LaunchChildGTestProcess(const CommandLine& command_line,
+                            base::TimeDelta timeout,
+                            bool* was_timeout);
+
 // Launches GTest-based tests from the current executable
 // using |launcher_delegate|.
 int LaunchTests(TestLauncherDelegate* launcher_delegate,