PushMessagingNotificationManager: extract IsTabVisible and test it.

chrome/browser/push_messaging/push_messaging_notification_manager_unittest.cc

+// Copyright 2015 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/push_messaging/push_messaging_notification_manager.h"
+
+#include "chrome/test/base/chrome_render_view_host_test_harness.h"
+#include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_renderer_host.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "url/gurl.h"
+
+class PushMessagingNotificationManagerTest
+    : public ChromeRenderViewHostTestHarness {};
+
+TEST_F(PushMessagingNotificationManagerTest, IsTabVisible) {
+  PushMessagingNotificationManager manager(profile());
+  GURL origin("https://google.com/");
+  NavigateAndCommit(origin);
+
+  EXPECT_FALSE(manager.IsTabVisible(profile(), nullptr, origin));
+  EXPECT_FALSE(manager.IsTabVisible(profile(), web_contents(),
+                                    GURL("https://chrome.com/")));
+  EXPECT_TRUE(manager.IsTabVisible(profile(), web_contents(), origin));
+
+  content::RenderViewHostTester::For(rvh())->SimulateWasHidden();
+  EXPECT_FALSE(manager.IsTabVisible(profile(), web_contents(), origin));
+
+  content::RenderViewHostTester::For(rvh())->SimulateWasShown();
+  EXPECT_TRUE(manager.IsTabVisible(profile(), web_contents(), origin));
+}