Make perftimer and run_all_perftests compile on Posix.  Stub out a few things into process_util_posix, and add a function to raise to a high priority.

BUG=1343318

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@1438 0039d316-1c4b-4281-b951-d872f2087c98

diff --git a/base/process_util.h b/base/process_util.h
index 978da42c..6c26a402 100644
--- a/base/process_util.h
+++ b/base/process_util.h

@@ -5,8 +5,8 @@
 // This file/namespace contains utility functions for enumerating, ending and
 // computing statistics of processes.
 
-#ifndef BASE_PROCESS_UTIL_H__
-#define BASE_PROCESS_UTIL_H__
+#ifndef BASE_PROCESS_UTIL_H_
+#define BASE_PROCESS_UTIL_H_
 
 #include "base/basictypes.h"
 
@@ -257,8 +257,10 @@
 // Note: Returns true on Windows 2000 without doing anything.
 bool EnableLowFragmentationHeap();
 
+// If supported on the platform, and the user has sufficent rights, increase
+// the current process's scheduling priority to a high priority.
+void RaiseProcessToHighPriority();
+
 }  // namespace process_util
 
-
-#endif  // BASE_PROCESS_UTIL_H__
-
+#endif  // BASE_PROCESS_UTIL_H_