[Video] MediaSession API event handlers can resume background video.

content/browser/media/session/media_session_impl_visibility_browsertest.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 <tuple>
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 158 matching lines @@
 
   void CheckSessionStateAfterHide() {
     MediaSessionImpl::State state_before_hide =
         ToMediaSessionState(GetVisibilityTestData().session_state_before_hide);
     MediaSessionImpl::State state_after_hide =
         ToMediaSessionState(GetVisibilityTestData().session_state_after_hide);
 
     if (state_before_hide == state_after_hide) {
       LOG(INFO) << "Waiting for 1 second and check session state is unchanged";
       Wait(base::TimeDelta::FromSeconds(1));
-      ASSERT_EQ(media_session_->audio_focus_state_, state_after_hide);
+      ASSERT_EQ(state_after_hide, media_session_->audio_focus_state_);
     } else {
       LOG(INFO) << "Waiting for Session to change";
       WaitForMediaSessionState(state_after_hide);
     }
 
     LOG(INFO) << "Test succeeded";
   }
 
  private:
   void LoadTestPage() {
@@ skipping 102 matching lines @@
   HideTab();
   CheckSessionStateAfterHide();
 }
 
 INSTANTIATE_TEST_CASE_P(MediaSessionImplVisibilityBrowserTestInstances,
                         MediaSessionImplVisibilityBrowserTest,
                         ::testing::Combine(::testing::ValuesIn(kTestParams),
                                            ::testing::ValuesIn(kPipelines)));
 
 }  // namespace content