[MediaSession, Android] Adding visibility tests for MediaSession

content/browser/media/session/media_session_visibility_browsertest_base.h

+// 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.
+
+#ifndef CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_VISIBILITY_BROWSER_TEST_BASE_H_
+#define CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_VISIBILITY_BROWSER_TEST_BASE_H_
+
+#include "content/public/test/content_browser_test.h"
+
+namespace base {
+class CommandLine;
+class TimeDelta;
+}
+
+namespace content {
+
+class WebContents;
+class MediaSession;
+
+// Base class of MediaSession visibility tests. The class is intended
+// to be used to run tests under different configurations. Tests
+// should inheret from this class, set up their own command line per
+// their configuration, and use macro INCLUDE_TEST_FROM_BASE_CLASS to
+// include required tests. See
+// media_session_visibility_browsertest_instances.cc for examples.
+class MediaSessionVisibilityBrowserTestBase
+    : public ContentBrowserTest {
+ public:
+  MediaSessionVisibilityBrowserTestBase() = default;
+
+  void SetUpOnMainThread() override;
+
+  void SetUpCommandLine(base::CommandLine* command_line) override;
+
+  void LoadTestPage();
+
+  void RunScript(std::string script);
+
+  // TODO(zqzhang): This method is shared with
+  // MediaRouterIntegrationTests. Move it into a general place.
+  bool ConditionalWait(base::TimeDelta timeout,
+                       base::TimeDelta interval,
+                       const base::Callback<bool(void)>& callback);
+
+  // TODO(zqzhang): This method is shared with
+  // MediaRouterIntegrationTests. Move it into a general place.
+  void Wait(base::TimeDelta timeout);
+
+  // Check the MediaSession state.
+  bool IsMediaSessionActive();
+  bool IsMediaSessionSuspended();
+  bool IsMediaSessionInactive();
+
+  // Wait for the MediaSession state to change.
+  bool WaitForMediaSessionActive();
+  bool WaitForMediaSessionSuspended();
+  bool WaitForMediaSessionInactive();
+
+ protected:
+  void TestSessionInactiveWhenHiddenAfterContentPause();
+  void TestSessionInactiveWhenHiddenWhilePlaying();
+  void TestSessionSuspendedWhenHiddenAfterContentPause();
+  void TestSessionActiveWhenHiddenWhilePlaying();
+
+  WebContents* web_contents_;
+  MediaSession* media_session_;
+};
+
+}  // namespace content
+
+#define INCLUDE_TEST_FROM_BASE_CLASS(test_fixture, test_name)     \
+  IN_PROC_BROWSER_TEST_F(test_fixture, test_name) {\
+    test_name();\
+  }
+
+#endif  // CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_VISIBILITY_BROWSER_TEST_BASE_H_