Add sandbox support for process memory limits

content/common/sandbox_win.cc

Index: content/common/sandbox_win.cc
diff --git a/content/common/sandbox_win.cc b/content/common/sandbox_win.cc
index 91fac7dbd4e81944d5f2cc1787de3870712e5c56..eabeef9f7d14657c01f69b543da2bd0fa9f074f1 100644
--- a/content/common/sandbox_win.cc
+++ b/content/common/sandbox_win.cc
@@ -494,10 +494,14 @@ void SetJobLevel(const CommandLine& cmd_line,
                  sandbox::JobLevel job_level,
                  uint32 ui_exceptions,
                  sandbox::TargetPolicy* policy) {
-  if (ShouldSetJobLevel(cmd_line))
+  if (ShouldSetJobLevel(cmd_line)) {
+#ifdef _WIN64
+    policy->SetJobMemoryLimit(4ULL * 1024 * 1024 * 1024, true);
+#endif
     policy->SetJobLevel(job_level, ui_exceptions);
-  else
+  } else {
     policy->SetJobLevel(sandbox::JOB_NONE, 0);
+  }
 }
 
 // TODO(jschuh): Need get these restrictions applied to NaCl and Pepper.