Make UITest::CrashAwareSleep portable.

base/process_util.h

Index: base/process_util.h
diff --git a/base/process_util.h b/base/process_util.h
index 11c5e1247919aa0f18b4e9142bcab3e726861d12..0f074b1515119a5354d61500a2ba0a4bdb7dd470 100644
--- a/base/process_util.h
+++ b/base/process_util.h
@@ -180,6 +180,10 @@ bool WaitForProcessesToExit(const std::wstring& executable_name,
 bool WaitForSingleProcess(ProcessHandle handle,
                           int wait_milliseconds);
 
+// Returns true when |wait_milliseconds| have elapsed and the process
+// is still running.
+bool CrashAwareSleep(ProcessHandle handle, int wait_milliseconds);
+
 // Waits a certain amount of time (can be 0) for all the processes with a given
 // executable name to exit, then kills off any of them that are still around.
 // If filter is non-null, then only processes selected by the filter are waited