Fix cpu/memory measurements on OS X.

chrome/test/chrome_process_util.h

Index: chrome/test/chrome_process_util.h
diff --git a/chrome/test/chrome_process_util.h b/chrome/test/chrome_process_util.h
index 19a5446ddb72e8d3c4fcd2bb36a840c31bff8999..4fb151374bd7dffa899a9a2a6af5a4dd3d61ca3d 100644
--- a/chrome/test/chrome_process_util.h
+++ b/chrome/test/chrome_process_util.h
@@ -57,7 +57,12 @@ class ChromeTestProcessMetrics {
 
  private:
   explicit ChromeTestProcessMetrics(base::ProcessHandle process) {
-    process_metrics_.reset(base::ProcessMetrics::CreateProcessMetrics(process));
+    process_metrics_.reset(
+#if !defined(OS_MACOSX)
+        base::ProcessMetrics::CreateProcessMetrics(process));
+#else
+        base::ProcessMetrics::CreateProcessMetrics(process, NULL));
+#endif
     process_handle_ = process;
   }