Add --enable-internal-media-session to trigger the MediaSession backend.

content/browser/media/session/media_session_browsertest.cc

Index: content/browser/media/session/media_session_browsertest.cc
diff --git a/content/browser/media/session/media_session_browsertest.cc b/content/browser/media/session/media_session_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c33254eaf38693198b5dab47b20339b118214221
--- /dev/null
+++ b/content/browser/media/session/media_session_browsertest.cc
@@ -0,0 +1,216 @@
+// Copyright 2017 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 "content/public/browser/media_session.h"
+
+#include "base/command_line.h"
+#include "base/run_loop.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "media/base/media_switches.h"
+
+namespace content {
+
+namespace {
+
+// Integration tests for content::MediaSession that do not take into
+// consideration the implementation details contrary to
+// MediaSessionImplBrowserTest.
+class MediaSessionBrowserTest : public ContentBrowserTest {
+ public:
+  MediaSessionBrowserTest() = default;
+
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    command_line->AppendSwitch(switches::kIgnoreAutoplayRestrictionsForTests);
+  }
+
+  void EnableInternalMediaSesion() {
+#if !defined(OS_ANDROID)
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kEnableInternalMediaSession);
+#endif  // !defined(OS_ANDROID)
+  }
+
+  void StartPlaybackAndWait(Shell* shell, const std::string& id) {
+    shell->web_contents()->GetMainFrame()->ExecuteJavaScriptForTests(
+        base::ASCIIToUTF16("document.querySelector('#" + id + "').play();"));
+    WaitForStart(shell);
+  }
+
+  void StopPlaybackAndWait(Shell* shell, const std::string& id) {
+    shell->web_contents()->GetMainFrame()->ExecuteJavaScriptForTests(
+        base::ASCIIToUTF16("document.querySelector('#" + id + "').pause();"));
+    WaitForStop(shell);
+  }
+
+  void WaitForStart(Shell* shell) {
+    MediaStartStopObserver observer(shell->web_contents(),
+                                    MediaStartStopObserver::Type::kStart);
+    observer.Wait();
+  }
+
+  void WaitForStop(Shell* shell) {
+    MediaStartStopObserver observer(shell->web_contents(),
+                                    MediaStartStopObserver::Type::kStop);
+    observer.Wait();
+  }
+
+  bool IsPlaying(Shell* shell, const std::string& id) {
+    bool result;
+    EXPECT_TRUE(
+        ExecuteScriptAndExtractBool(shell->web_contents(),
+                                    "window.domAutomationController.send("
+                                    "!document.querySelector('#" +
+                                        id + "').paused);",
+                                    &result));
+    return result;
+  }
+
+ private:
+  class MediaStartStopObserver : public WebContentsObserver {
+   public:
+    enum class Type { kStart, kStop };
+
+    MediaStartStopObserver(WebContents* web_contents, Type type)
+        : WebContentsObserver(web_contents), type_(type) {}
+
+    void MediaStartedPlaying(const MediaPlayerInfo& info,
+                             const MediaPlayerId& id) override {
+      if (type_ != Type::kStart)
+        return;
+
+      run_loop_.Quit();
+    }
+
+    void MediaStoppedPlaying(const MediaPlayerInfo& info,
+                             const MediaPlayerId& id) override {
+      if (type_ != Type::kStop)
+        return;
+
+      run_loop_.Quit();
+    }
+
+    void Wait() { run_loop_.Run(); }
+
+   private:
+    base::RunLoop run_loop_;
+    Type type_;
+
+    DISALLOW_COPY_AND_ASSIGN(MediaStartStopObserver);
+  };
+
+  DISALLOW_COPY_AND_ASSIGN(MediaSessionBrowserTest);
+};
+
+}  // anonymous namespace
+
+#if !defined(OS_ANDROID)
+// The feature can't be disabled on Android.
+IN_PROC_BROWSER_TEST_F(MediaSessionBrowserTest, MediaSessionNoOpWhenDisabled) {
+  NavigateToURL(shell(), GetTestUrl("media/session", "media-session.html"));
+
+  MediaSession* media_session = MediaSession::Get(shell()->web_contents());
+  ASSERT_NE(nullptr, media_session);
+
+  StartPlaybackAndWait(shell(), "long-video");
+  StartPlaybackAndWait(shell(), "long-audio");
+
+  media_session->Suspend(MediaSession::SuspendType::SYSTEM);
+  StopPlaybackAndWait(shell(), "long-audio");
+
+  // At that point, only "long-audio" is paused.
+  EXPECT_FALSE(IsPlaying(shell(), "long-audio"));
+  EXPECT_TRUE(IsPlaying(shell(), "long-video"));
+}
+#endif  // !defined(OS_ANDROID)
+
+IN_PROC_BROWSER_TEST_F(MediaSessionBrowserTest, SimplePlayPause) {
+  EnableInternalMediaSesion();
+
+  NavigateToURL(shell(), GetTestUrl("media/session", "media-session.html"));
+
+  MediaSession* media_session = MediaSession::Get(shell()->web_contents());
+  ASSERT_NE(nullptr, media_session);
+
+  StartPlaybackAndWait(shell(), "long-video");
+
+  media_session->Suspend(MediaSession::SuspendType::SYSTEM);
+  WaitForStop(shell());
+  EXPECT_FALSE(IsPlaying(shell(), "long-video"));
+
+  media_session->Resume(MediaSession::SuspendType::SYSTEM);
+  WaitForStart(shell());
+  EXPECT_TRUE(IsPlaying(shell(), "long-video"));
+}
+
+IN_PROC_BROWSER_TEST_F(MediaSessionBrowserTest, MultiplePlayersPlayPause) {
+  EnableInternalMediaSesion();
+
+  NavigateToURL(shell(), GetTestUrl("media/session", "media-session.html"));
+
+  MediaSession* media_session = MediaSession::Get(shell()->web_contents());
+  ASSERT_NE(nullptr, media_session);
+
+  StartPlaybackAndWait(shell(), "long-video");
+  StartPlaybackAndWait(shell(), "long-audio");
+
+  media_session->Suspend(MediaSession::SuspendType::SYSTEM);
+  WaitForStop(shell());
+  EXPECT_FALSE(IsPlaying(shell(), "long-video"));
+  EXPECT_FALSE(IsPlaying(shell(), "long-audio"));
+
+  media_session->Resume(MediaSession::SuspendType::SYSTEM);
+  WaitForStart(shell());
+  EXPECT_TRUE(IsPlaying(shell(), "long-video"));
+  EXPECT_TRUE(IsPlaying(shell(), "long-audio"));
+}
+
+#if !defined(OS_ANDROID)
+// On Android, System Audio Focus would break this test.
+IN_PROC_BROWSER_TEST_F(MediaSessionBrowserTest, MultipleTabsPlayPause) {
+  EnableInternalMediaSesion();
+
+  Shell* other_shell = CreateBrowser();
+
+  NavigateToURL(shell(), GetTestUrl("media/session", "media-session.html"));
+  NavigateToURL(other_shell, GetTestUrl("media/session", "media-session.html"));
+
+  MediaSession* media_session = MediaSession::Get(shell()->web_contents());
+  MediaSession* other_media_session =
+      MediaSession::Get(other_shell->web_contents());
+  ASSERT_NE(nullptr, media_session);
+  ASSERT_NE(nullptr, other_media_session);
+
+  StartPlaybackAndWait(shell(), "long-video");
+  StartPlaybackAndWait(other_shell, "long-video");
+
+  media_session->Suspend(MediaSession::SuspendType::SYSTEM);
+  WaitForStop(shell());
+  EXPECT_FALSE(IsPlaying(shell(), "long-video"));
+  EXPECT_TRUE(IsPlaying(other_shell, "long-video"));
+
+  other_media_session->Suspend(MediaSession::SuspendType::SYSTEM);
+  WaitForStop(other_shell);
+  EXPECT_FALSE(IsPlaying(shell(), "long-video"));
+  EXPECT_FALSE(IsPlaying(other_shell, "long-video"));
+
+  media_session->Resume(MediaSession::SuspendType::SYSTEM);
+  WaitForStart(shell());
+  EXPECT_TRUE(IsPlaying(shell(), "long-video"));
+  EXPECT_FALSE(IsPlaying(other_shell, "long-video"));
+
+  other_media_session->Resume(MediaSession::SuspendType::SYSTEM);
+  WaitForStart(other_shell);
+  EXPECT_TRUE(IsPlaying(shell(), "long-video"));
+  EXPECT_TRUE(IsPlaying(other_shell, "long-video"));
+}
+#endif  // defined(OS_ANDROID)
+
+}  // namespace content