Add and alternative GetAppOutput() to process_util that takes a timeout....

base/process_util.h

Index: base/process_util.h
===================================================================
--- base/process_util.h	(revision 52438)
+++ base/process_util.h	(working copy)
@@ -85,6 +85,9 @@
 // A minimalistic but hopefully cross-platform set of exit codes.
 // Do not change the enumeration values or you will break third-party
 // installers.
+// Warning: This enum is duplicated and extended in chrome/common/result_codes.h
+// The two must be kept in sync and users of that enum would prefer the
+// numbering didn't change.
 enum {
   PROCESS_END_NORMAL_TERMINATION = 0,
   PROCESS_END_KILLED_BY_USER     = 1,
@@ -239,6 +242,15 @@
 bool GetAppOutput(const CommandLine& cl, std::string* output);
 
 #if defined(OS_POSIX)
+// Similar to |GetAppOutput()|. Returns true if process launched and
+// exited cleanly, with exit code indicating success. Waits no more than
+// |timeout_milliseconds| for the launched process to exit. After timeout
+// is triggered, the process is killed and true is stored in |timed_out|.
+// Will wait for process to die so this may overrun |timeout_milliseconds|.
+// TODO(tessamac): implement this for windows.
+bool GetAppOutputWithTimeout(const CommandLine& cl, std::string* output,
+                             bool* timed_out, int timeout_milliseconds);
+
 // A restricted version of |GetAppOutput()| which (a) clears the environment,
 // and (b) stores at most |max_output| bytes; also, it doesn't search the path
 // for the command.