Fix crash when TTS utterances are queued on shutdown.

chrome/browser/extensions/extension_tts_api_controller_unittest.cc

+// Copyright (c) 2011 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.
+
+// Unit tests for the TTS API Controller.
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "base/values.h"
+#include "chrome/browser/extensions/extension_tts_api_controller.h"
+#include "chrome/browser/extensions/extension_tts_api_platform.h"
+
+class ExtensionTtsApiControllerTest : public testing::Test {
+};
+
+// Platform Tts implementation that does nothing.
+class DummyExtensionTtsPlatformImpl : public ExtensionTtsPlatformImpl {
+ public:
+  DummyExtensionTtsPlatformImpl() {}
+  virtual ~DummyExtensionTtsPlatformImpl() {}
+  virtual bool PlatformImplAvailable() { return true; }
+  virtual bool Speak(
+      int utterance_id,
+      const std::string& utterance,
+      const std::string& lang,
+      const UtteranceContinuousParameters& params) {
+    return true;
+  }
+  virtual bool StopSpeaking() { return true; }
+  virtual bool SendsEvent(TtsEventType event_type) { return false; }
+  virtual std::string gender() { return std::string(); }
+  virtual std::string error() { return std::string(); }
+  virtual void clear_error() {}
+  virtual void set_error(const std::string& error) {}
+};
+
+// Subclass of ExtensionTtsController with a public ctor and dtor.
+class TestableExtensionTtsController : public ExtensionTtsController {
+ public:
+  TestableExtensionTtsController() {}
+  virtual ~TestableExtensionTtsController() {}
+};
+
+TEST_F(ExtensionTtsApiControllerTest, TestTtsControllerShutdown) {
+  DummyExtensionTtsPlatformImpl platform_impl;
+  TestableExtensionTtsController* controller =
+      new TestableExtensionTtsController();
+  controller->SetPlatformImpl(&platform_impl);
+
+  Utterance* utterance1 = new Utterance(NULL);
+  utterance1->set_can_enqueue(true);
+  utterance1->set_src_id(1);
+  controller->SpeakOrEnqueue(utterance1);
+
+  Utterance* utterance2 = new Utterance(NULL);
+  utterance2->set_can_enqueue(true);
+  utterance2->set_src_id(2);
+  controller->SpeakOrEnqueue(utterance2);
+
+  // Make sure that deleting the controller when there are pending
+  // utterances doesn't cause a crash.
+  delete controller;
+}