Autoplay: override autoplay restrictions on Chrome Apps/Extensions.

This is forcing no autoplay restrictions to all `Extensions`. It does
not apply to WebViews.

Bug: 788302
Change-Id: I9c7e89133279453382976ff0f79d285672a5f1ac
Reviewed-on: https://chromium-review.googlesource.com/803440Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523747}

chrome/browser/apps/guest_view/web_view_browsertest.cc

@@ -1084,6 +1084,17 @@ IN_PROC_BROWSER_TEST_P(WebViewTest, AudioStateJavascriptAPI) {
       << message_;
 }
 
+// Test that WebView does not override autoplay policy.
+IN_PROC_BROWSER_TEST_P(WebViewTest, AutoplayPolicy) {
+  base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+      switches::kAutoplayPolicy,
+      switches::autoplay::kDocumentUserActivationRequiredPolicy);
+
+  ASSERT_TRUE(StartEmbeddedTestServer());
+  ASSERT_TRUE(RunPlatformAppTest("platform_apps/web_view/autoplay"))
+      << message_;
+}
+
 // This test verifies that hiding the guest triggers WebContents::WasHidden().
 IN_PROC_BROWSER_TEST_P(WebViewVisibilityTest, GuestVisibilityChanged) {
   LoadAppWithGuest("web_view/visibility_changed");

chrome/browser/extensions/autoplay_browsertest.cc

+// 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 "chrome/browser/extensions/extension_apitest.h"
+#include "media/base/media_switches.h"
+
+class AutoplayExtensionBrowserTest : public ExtensionApiTest {
+ public:
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    ExtensionBrowserTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitchASCII(
+        switches::kAutoplayPolicy,
+        switches::autoplay::kDocumentUserActivationRequiredPolicy);
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(AutoplayExtensionBrowserTest, AutoplayAllowed) {
+  ASSERT_TRUE(RunExtensionTest("autoplay")) << message_;
+}

chrome/browser/extensions/extension_webkit_preferences.cc

@@ -39,6 +39,11 @@ void SetPreferences(const extensions::Extension* extension,
   // Enable WebGL features that regular pages can't access, since they add
   // more risk of fingerprinting.
   webkit_prefs->privileged_webgl_extensions_enabled = true;
+
+  // Autoplay restrictions should not apply to extensions, packaged apps,
+  // hosted apps, etc. However, they should not apply to apps' webviews.
+  webkit_prefs->autoplay_policy =
+      content::AutoplayPolicy::kNoUserGestureRequired;
 }
 
 }  // namespace extension_webkit_preferences

chrome/test/BUILD.gn

@@ -1170,6 +1170,7 @@ test("browser_tests") {
         "../browser/extensions/app_background_page_apitest.cc",
         "../browser/extensions/app_process_apitest.cc",
         "../browser/extensions/app_window_overrides_browsertest.cc",
+        "../browser/extensions/autoplay_browsertest.cc",
         "../browser/extensions/background_app_browsertest.cc",
         "../browser/extensions/background_page_apitest.cc",
         "../browser/extensions/background_scripts_apitest.cc",

chrome/test/data/extensions/autoplay/background.js

+// 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.
+
+chrome.test.runTests([
+  function autoplay_allowed_without_gesture() {
+    var audio = new Audio();
+    audio.src = 'test.mp4';
+    var allowed = false;
+    audio.play().then(function() {
+      allowed = true;
+    }, function(e) {
+      allowed = e.name != 'NotAllowedError';
+    }).then(function() {
+      chrome.test.assertTrue(allowed);
+      chrome.test.succeed();
+    });
+  }
+]);

chrome/test/data/extensions/autoplay/manifest.json

+{
+  "name": "autoplay",
+  "description": "autoplay policy test",
+  "version": "1.0",
+  "manifest_version": 2,
+  "background": {
+    "scripts": ["background.js"]
+  },
+  "permissions": [ ]
+}

chrome/test/data/extensions/platform_apps/web_view/autoplay/guest.html

+<!--
+ * 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.
+-->
+<!DOCTYPE html>
+<html>
+<body>
+  <script src=guest.js></script>
+</body>
+</html>

chrome/test/data/extensions/platform_apps/web_view/autoplay/guest.js

+// 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.
+
+window.addEventListener('message', function() {
+  var audio = document.createElement('audio');
+  audio.src = 'test.mp4';
+  audio.play().then(() => {
+    console.log('autoplayed');
+  }, e => {
+    console.log(e.name);
+  });
+});

chrome/test/data/extensions/platform_apps/web_view/autoplay/main.html

+<!--
+ * 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.
+-->
+<!DOCTYPE html>
+<html>
+<body>
+  <webview></webview>
+  <script src=main.js></script>
+</body>
+</html>

chrome/test/data/extensions/platform_apps/web_view/autoplay/main.js

+// 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.
+
+chrome.test.getConfig(function(config) {
+  var guestUrl = 'http://localhost:' + config.testServer.port +
+      '/extensions/platform_apps/web_view/autoplay/guest.html';
+
+  var webview = document.querySelector('webview');
+  webview.addEventListener('loadstop', function() {
+    webview.onconsolemessage = function(e) {
+      chrome.test.assertEq('NotAllowedError', e.message);
+      chrome.test.succeed();
+    };
+
+    webview.contentWindow.postMessage(JSON.stringify('start'), '*');
+  }, { once: true });
+
+  webview.src = guestUrl;
+});

chrome/test/data/extensions/platform_apps/web_view/autoplay/manifest.json

+{
+  "name": "<webview> autoplay policy api tests.",
+  "version": "1",
+  "permissions": [
+    "webview"
+  ],
+  "app": {
+    "background": {
+      "scripts": ["test.js"]
+    }
+  }
+}

chrome/test/data/extensions/platform_apps/web_view/autoplay/test.js

+// 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.
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  chrome.app.window.create('main.html', {}, function() {});
+});