Implement a new child test helper for Android.

base/test/multiprocess_test.h

Index: base/test/multiprocess_test.h
diff --git a/base/test/multiprocess_test.h b/base/test/multiprocess_test.h
index ab1d0ca4c02698b9466a6d3949b700d9a874d688..e0d54d399978a58bfbfbefdb5762293e9364002c 100644
--- a/base/test/multiprocess_test.h
+++ b/base/test/multiprocess_test.h
@@ -66,6 +66,21 @@ Process SpawnMultiProcessTestChild(
 // may add any flags needed for your child process.
 CommandLine GetMultiProcessTestChildBaseCommandLine();
 
+#if defined(OS_ANDROID)
+
+// Enable the alternate test child implementation which support spawning a child
+// after threads have been created. If used, this MUST be the first line of
+// main(). The main function is passed in to avoid a link-time dependency in
+// component builds.
+void InitAndroidMultiProcessTestHelper(int (*main)(int, char**));
+
+// Wait for a test child to exit if the alternate tech child implementation is

[Paweł Hajdan Jr., 2016/04/26 20:19:43]

What's "alternate tech child"? Should "tech" change to "test"?

[Anand Mistry (off Chromium), 2016/04/26 23:50:38]

Done.

+// being used.
+bool AndroidWaitForChildExitWithTimeout(

[Paweł Hajdan Jr., 2016/04/26 20:19:43]

nit: WARN_UNUSED_RESULT

[Anand Mistry (off Chromium), 2016/04/26 23:50:39]

Done.

+    const Process& process, TimeDelta timeout, int* exit_code);
+
+#endif

[Paweł Hajdan Jr., 2016/04/26 20:19:43]

nit:  // defined(OS_ANDROID)

[Anand Mistry (off Chromium), 2016/04/26 23:50:39]

Done.

+
 // MultiProcessTest ------------------------------------------------------------
 
 // A MultiProcessTest is a test class which makes it easier to