Test Keeping NaCl plugins used in app background pages alive when active.

components/nacl/browser/nacl_process_host.cc

Index: components/nacl/browser/nacl_process_host.cc
diff --git a/components/nacl/browser/nacl_process_host.cc b/components/nacl/browser/nacl_process_host.cc
index 7aa7e3af049da4b816f66cc3c729aa6c8c9f2053..6d8a6473577fa03cff2afc2daa2e292e4228d4e1 100644
--- a/components/nacl/browser/nacl_process_host.cc
+++ b/components/nacl/browser/nacl_process_host.cc
@@ -807,7 +807,11 @@ void NaClProcessHost::OnPpapiChannelCreated(
     args.permissions = permissions_;
     CommandLine* cmdline = CommandLine::ForCurrentProcess();
     DCHECK(cmdline);
-    std::string flag_whitelist[] = {switches::kV, switches::kVModule};
+    std::string flag_whitelist[] = {
+      switches::kPpapiKeepAliveThrottle,
+      switches::kV,
+      switches::kVModule,
+    };
     for (size_t i = 0; i < arraysize(flag_whitelist); ++i) {
       std::string value = cmdline->GetSwitchValueASCII(flag_whitelist[i]);
       if (!value.empty()) {