Multiprocess test client: Android child process launcher rework.

base/process/process_posix.cc

Index: base/process/process_posix.cc
diff --git a/base/process/process_posix.cc b/base/process/process_posix.cc
index 20fab9214163075fd0b0e39fbf64832a3463881f..55b7ac90e2952de74c28408c90163b727ca7cdc5 100644
--- a/base/process/process_posix.cc
+++ b/base/process/process_posix.cc
@@ -350,11 +350,11 @@ bool Process::Terminate(int exit_code, bool wait) const {
 }
 #endif  // !defined(OS_NACL_NONSFI)
 
-bool Process::WaitForExit(int* exit_code) {
+bool Process::WaitForExit(int* exit_code) const {
   return WaitForExitWithTimeout(TimeDelta::Max(), exit_code);
 }
 
-bool Process::WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) {
+bool Process::WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) const {
   // Record the event that this thread is blocking upon (for hang diagnosis).
   base::debug::ScopedProcessWaitActivity process_activity(this);