Defer media playback in background tabs.

chrome/browser/media/defer_background_media_browsertest.cc

Index: chrome/browser/media/defer_background_media_browsertest.cc
diff --git a/chrome/browser/media/defer_background_media_browsertest.cc b/chrome/browser/media/defer_background_media_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..daa3e6b8dc5863f32d03a945af821eb89ee8c8c8
--- /dev/null
+++ b/chrome/browser/media/defer_background_media_browsertest.cc
@@ -0,0 +1,60 @@
+// 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 "base/strings/utf_string_conversions.h"
+#include "build/build_config.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/test/browser_test_utils.h"
+#include "media/base/test_data_util.h"
+
+// TODO(dalecurtis): Android does not correctly defer media today, fix and
+// enable this test (needs disable of user gesture).  http://crbug.com/522157
+#if !defined(OS_ANDROID)
+typedef InProcessBrowserTest MediaBrowserTest;
+
+IN_PROC_BROWSER_TEST_F(MediaBrowserTest, BackgroundMediaIsDeferred) {
+  // Navigate to a video file, which would autoplay in the foreground, but won't
+  // in the background due to deferred media loading for hidden tabs.
+  ui_test_utils::NavigateToURLWithDisposition(
+      browser(), content::GetFileUrlWithQuery(
+                     media::GetTestDataFilePath("bear-640x360.webm"), ""),
+      NEW_BACKGROUND_TAB, ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
+
+  ASSERT_EQ(2, browser()->tab_strip_model()->count());
+  content::WebContents* background_contents =
+      browser()->tab_strip_model()->GetWebContentsAt(1);
+  EXPECT_TRUE(
+      content::WaitForRenderFrameReady(background_contents->GetMainFrame()));
+  EXPECT_NE(background_contents,
+            browser()->tab_strip_model()->GetActiveWebContents());
+
+  // If autoplay for background tabs isn't deferred the play event listener will
+  // be attached too late to catch the event, and subsequently the test will hit
+  // the ended event before the play event.
+  EXPECT_TRUE(
+      content::ExecuteScript(background_contents,
+                             "var video = document.querySelector('video');"
+                             "video.addEventListener('ended', function(event) {"
+                             "  document.title = 'ended';"
+                             "}, false);"
+                             "video.addEventListener('play', function(event) {"
+                             "  document.title = 'playing';"
+                             "}, false);"));
+
+  // Make the background tab w/ our video the active tab.
+  browser()->tab_strip_model()->SelectNextTab();
+  EXPECT_EQ(background_contents,
+            browser()->tab_strip_model()->GetActiveWebContents());
+
+  // If everything worked, we should see "playing" and not "ended".
+  const base::string16 playing_str = base::UTF8ToUTF16("playing");
+  const base::string16 ended_str = base::UTF8ToUTF16("ended");
+  content::TitleWatcher watcher(background_contents, playing_str);
+  watcher.AlsoWaitForTitle(ended_str);
+  EXPECT_EQ(playing_str, watcher.WaitAndGetTitle());
+}
+#endif  // !defined(OS_ANDROID)