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

ppapi/tests/extensions/background_keepalive/background.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <cstdio>
+#include <string>
+
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/message_loop.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/var.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+class Instance : public pp::Instance {
+ public:
+  explicit Instance(PP_Instance instance) :
+      pp::Instance(instance),
+      callback_factory_(this),
+      delay_milliseconds_(10),
+      active_(true) {
+    DoSomething(PP_OK);
+  }
+  virtual ~Instance() {}
+
+  virtual void HandleMessage(const pp::Var& message_var) {
+    std::string message_string = message_var.AsString();
+    if (message_string == "be idle") {
+      active_ = false;
+    } else {
+      PostMessage("Unhandled control message.");
+    }
+  }
+
+  void DoSomething(int32_t result) {
+    if (active_) {
+      pp::MessageLoop loop = pp::MessageLoop::GetCurrent();
+      pp::CompletionCallback c = callback_factory_.NewCallback(
+          &Instance::DoSomething);
+      loop.PostWork(c, delay_milliseconds_);
+    }
+  }
+
+  pp::CompletionCallbackFactory<Instance> callback_factory_;
+  int delay_milliseconds_;
+  bool active_;
+};
+
+class Module : public pp::Module {
+ public:
+  Module() : pp::Module() {}
+  virtual ~Module() {}
+
+  virtual pp::Instance* CreateInstance(PP_Instance instance) {
+    return new Instance(instance);
+  }
+};
+
+namespace pp {
+Module* CreateModule() {
+  return new ::Module();
+}
+}  // namespace pp
+