Add ScopedKeepAlive to c/b/lifetime

chrome/browser/lifetime/keep_alive_registry_unittest.cc

+// Copyright 2016 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 "chrome/browser/lifetime/keep_alive_registry.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/lifetime/application_lifetime.h"
+#include "chrome/browser/lifetime/keep_alive_types.h"
+#include "chrome/browser/lifetime/scoped_keep_alive.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// Test the WillKeepAlive state and when we interact with the browser with
+// a KeepAlive registered.
+TEST(KeepAliveRegistryTest, BasicKeepAliveTest) {
+  const int base_keep_alive_count = chrome::GetKeepAliveCountForTesting();
+  KeepAliveRegistry* registry = KeepAliveRegistry::GetInstance();
+
+  EXPECT_FALSE(registry->WillKeepAlive());
+
+  {
+    // Arbitrarily chosen Origin
+    ScopedKeepAlive test_keep_alive(KeepAliveOrigin::CHROME_APP_DELEGATE);
+
+    // We should require the browser to stay alive
+    EXPECT_EQ(base_keep_alive_count + 1, chrome::GetKeepAliveCountForTesting());
+    EXPECT_TRUE(registry->WillKeepAlive());
+  }
+
+  // We should be back to normal now.
+  EXPECT_EQ(base_keep_alive_count, chrome::GetKeepAliveCountForTesting());
+  EXPECT_FALSE(registry->WillKeepAlive());
+}
+
+// Test the WillKeepAlive state and when we interact with the browser with
+// more than one KeepAlive registered.
+TEST(KeepAliveRegistryTest, DoubleKeepAliveTest) {
+  const int base_keep_alive_count = chrome::GetKeepAliveCountForTesting();
+  KeepAliveRegistry* registry = KeepAliveRegistry::GetInstance();
+  scoped_ptr<ScopedKeepAlive> keep_alive_1, keep_alive_2;
+
+  keep_alive_1.reset(new ScopedKeepAlive(KeepAliveOrigin::CHROME_APP_DELEGATE));
+  EXPECT_EQ(base_keep_alive_count + 1, chrome::GetKeepAliveCountForTesting());
+  EXPECT_TRUE(registry->WillKeepAlive());
+
+  keep_alive_2.reset(new ScopedKeepAlive(KeepAliveOrigin::CHROME_APP_DELEGATE));
+  // We should not increment the count twice
+  EXPECT_EQ(base_keep_alive_count + 1, chrome::GetKeepAliveCountForTesting());
+  EXPECT_TRUE(registry->WillKeepAlive());
+
+  keep_alive_1.reset();
+  // We should not decrement the count before the last keep alive is released.
+  EXPECT_EQ(base_keep_alive_count + 1, chrome::GetKeepAliveCountForTesting());
+  EXPECT_TRUE(registry->WillKeepAlive());
+
+  keep_alive_2.reset();
+  EXPECT_EQ(base_keep_alive_count, chrome::GetKeepAliveCountForTesting());
+  EXPECT_FALSE(registry->WillKeepAlive());
+}