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 355305e33c2434c4b0679e92a59859701a0d9143..04ad374eec78a81fc7de20365bc10aec281ec3aa 100644
--- a/content/common/sandbox_win.cc
+++ b/content/common/sandbox_win.cc
@@ -496,10 +496,14 @@ 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);
+#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.