[MediaSession] Add playbackState attribute to Blink MediaSession and use it to determine playback s…

content/browser/media/session/media_session_impl_browsertest.cc

Index: content/browser/media/session/media_session_impl_browsertest.cc
diff --git a/content/browser/media/session/media_session_impl_browsertest.cc b/content/browser/media/session/media_session_impl_browsertest.cc
index c9ecbb30fd118d83ed456aabbb49efa2b9b460d6..9132ffd8881a0c963454a2ce8c1bb528562cd670 100644
--- a/content/browser/media/session/media_session_impl_browsertest.cc
+++ b/content/browser/media/session/media_session_impl_browsertest.cc
@@ -15,6 +15,7 @@
 #include "base/test/histogram_tester.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "content/browser/media/session/audio_focus_delegate.h"
+#include "content/browser/media/session/media_session_service_impl.h"
 #include "content/browser/media/session/mock_media_session_player_observer.h"
 #include "content/public/browser/media_session.h"
 #include "content/public/browser/media_session_observer.h"
@@ -62,6 +63,13 @@ class MockMediaSessionObserver : public MediaSessionObserver {
   MOCK_METHOD0(MediaSessionDestroyed, void());
 };
 
+class MockMediaSessionServiceImpl : public content::MediaSessionServiceImpl {
+ public:
+  explicit MockMediaSessionServiceImpl(content::RenderFrameHost* rfh)
+      : MediaSessionServiceImpl(rfh) {}
+  ~MockMediaSessionServiceImpl() override = default;
+};
+
 }  // namespace
 
 class MediaSessionImplBrowserTest : public content::ContentBrowserTest {
@@ -82,6 +90,7 @@ class MediaSessionImplBrowserTest : public content::ContentBrowserTest {
 
   void TearDownOnMainThread() override {
     mock_media_session_observer_.reset();
+    mock_media_session_service_.reset();
 
     media_session_->RemoveAllPlayersForTest();
     media_session_ = nullptr;
@@ -145,6 +154,16 @@ class MediaSessionImplBrowserTest : public content::ContentBrowserTest {
 
   void SystemStopDucking() { media_session_->StopDucking(); }
 
+  void EnsureMediaSessionService() {
+    mock_media_session_service_.reset(new MockMediaSessionServiceImpl(
+        shell()->web_contents()->GetMainFrame()));
+    mock_media_session_service_->SetMetadata(content::MediaMetadata());
+  }
+
+  void SetPlaybackState(blink::mojom::MediaSessionPlaybackState state) {
+    mock_media_session_service_->SetPlaybackState(state);
+  }
+
   MockMediaSessionObserver* mock_media_session_observer() {
     return mock_media_session_observer_.get();
   }
@@ -165,6 +184,7 @@ class MediaSessionImplBrowserTest : public content::ContentBrowserTest {
   MediaSessionImpl* media_session_;
   std::unique_ptr<MockMediaSessionObserver> mock_media_session_observer_;
   MockAudioFocusDelegate* mock_audio_focus_delegate_;
+  std::unique_ptr<MockMediaSessionServiceImpl> mock_media_session_service_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaSessionImplBrowserTest);
 };
@@ -1027,6 +1047,84 @@ IN_PROC_BROWSER_TEST_F(MediaSessionImplBrowserTest,
 }
 
 IN_PROC_BROWSER_TEST_F(MediaSessionImplBrowserTest,
+                       ActualPlaybackStateWhilePlayerPaused) {
+  EnsureMediaSessionService();
+  auto player_observer = base::MakeUnique<MockMediaSessionPlayerObserver>(
+      shell()->web_contents()->GetMainFrame());
+
+  ::testing::Sequence s;
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, false))
+      .InSequence(s);
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, true))
+      .InSequence(s);
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, false))
+      .InSequence(s);
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, true))
+      .InSequence(s);
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, true))
+      .InSequence(s);
+
+  StartNewPlayer(player_observer.get(), media::MediaContentType::Persistent);
+  OnPlayerPaused(player_observer.get(), 0);
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::PLAYING);
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::PAUSED);
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::NONE);
+}
+
+IN_PROC_BROWSER_TEST_F(MediaSessionImplBrowserTest,
+                       ActualPlaybackStateWhilePlayerPlaying) {
+  EnsureMediaSessionService();
+  auto player_observer = base::MakeUnique<MockMediaSessionPlayerObserver>(
+      shell()->web_contents()->GetMainFrame());
+
+  ::testing::Sequence s;
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, false))
+      .InSequence(s);
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, false))
+      .InSequence(s);
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, false))
+      .InSequence(s);
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, false))
+      .InSequence(s);
+
+  StartNewPlayer(player_observer.get(), media::MediaContentType::Persistent);
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::PLAYING);
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::PAUSED);
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::NONE);
+}
+
+IN_PROC_BROWSER_TEST_F(MediaSessionImplBrowserTest,
+                       ActualPlaybackStateWhilePlayerRemoved) {
+  EnsureMediaSessionService();
+  auto player_observer = base::MakeUnique<MockMediaSessionPlayerObserver>(
+      shell()->web_contents()->GetMainFrame());
+
+  ::testing::Sequence s;
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(true, false))
+      .InSequence(s);
+  EXPECT_CALL(*mock_media_session_observer(),
+              MediaSessionStateChanged(false, _))
+      .InSequence(s);
+
+  StartNewPlayer(player_observer.get(), media::MediaContentType::Persistent);
+  RemovePlayer(player_observer.get(), 0);
+
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::PLAYING);
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::PAUSED);
+  SetPlaybackState(blink::mojom::MediaSessionPlaybackState::NONE);
+}
+
+IN_PROC_BROWSER_TEST_F(MediaSessionImplBrowserTest,
                        UMA_Suspended_SystemTransient) {
   auto player_observer = base::MakeUnique<MockMediaSessionPlayerObserver>();
   base::HistogramTester tester;