PPAPI: Make PPB_MessageLoop_Dev::GetForMainThread work

ppapi/tests/test_message_loop.h

+// Copyright (c) 2012 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.
+
+#ifndef PAPPI_TESTS_TEST_MESSAGE_LOOP_H_
+#define PAPPI_TESTS_TEST_MESSAGE_LOOP_H_
+
+#include <string>
+
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/tests/test_case.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+namespace pp {
+class MessageLoop;
+}
+
+class TestMessageLoop : public TestCase {
+ public:
+  explicit TestMessageLoop(TestingInstance* instance);
+  virtual ~TestMessageLoop();
+
+ private:
+  // TestCase implementation.
+  virtual void RunTests(const std::string& filter);
+
+  std::string TestBasics();
+  std::string TestPost();
+
+  // This just ensures we have a unique number for each little thing we test.
+  enum TestParam { kInvalid, kMainToMain, kBeforeStart, kAfterStart};
+
+  // A task to run on the main thread. It sets param_ and quits the main loop.
+  void SetParamAndQuitTask(int32_t result, TestParam param);
+
+  // A task to run on a background thread. It posts SetResultAndQuitTask to the
+  // main loop, echoing result.
+  void EchoParamToMainTask(int32_t result, TestParam param);
+
+  // The last test param we received in SetParamAndQuitTask (or kInvalid if
+  // none).
+  TestParam param_;
+  pp::CompletionCallbackFactory<TestMessageLoop> callback_factory_;
+  NestedEvent main_loop_task_ran_;
+};
+
+#endif  // PAPPI_TESTS_TEST_MESSAGE_LOOP_H_