Implement nested dedicated workers

This change exposes the Worker() constructor to dedicated workers,
allowing them to create descendant workers.

Chrome feature entry:
https://www.chromestatus.com/feature/6080438103703552

Intent to Implement and Ship:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/KZx0i3e5nZM

Bug: 31666
Change-Id: I449978641f7ee4afba2a1087da91d84b78559abb
Reviewed-on: https://chromium-review.googlesource.com/953746Reviewed-by: Ojan Vafai <ojan@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576225}

content/browser/dedicated_worker/dedicated_worker_host.cc

@@ -28,10 +28,10 @@ namespace {
 class DedicatedWorkerHost : public service_manager::mojom::InterfaceProvider {
  public:
   DedicatedWorkerHost(int process_id,
-                      int parent_render_frame_id,
+                      int ancestor_render_frame_id,
                       const url::Origin& origin)
       : process_id_(process_id),
-        parent_render_frame_id_(parent_render_frame_id),
+        ancestor_render_frame_id_(ancestor_render_frame_id),
         origin_(origin) {
     RegisterMojoInterfaces();
   }
@@ -58,18 +58,21 @@ class DedicatedWorkerHost : public service_manager::mojom::InterfaceProvider {
         &DedicatedWorkerHost::CreateWebSocket, base::Unretained(this)));
     registry_.AddInterface(base::BindRepeating(
         &DedicatedWorkerHost::CreateUsbDeviceManager, base::Unretained(this)));
+    registry_.AddInterface(base::BindRepeating(
+        &DedicatedWorkerHost::CreateDedicatedWorker, base::Unretained(this)));
   }
 
   void CreateUsbDeviceManager(device::mojom::UsbDeviceManagerRequest request) {
     auto* host =
-        RenderFrameHostImpl::FromID(process_id_, parent_render_frame_id_);
+        RenderFrameHostImpl::FromID(process_id_, ancestor_render_frame_id_);
     GetContentClient()->browser()->CreateUsbDeviceManager(host,
                                                           std::move(request));
   }
 
   void CreateWebSocket(network::mojom::WebSocketRequest request) {
     network::mojom::AuthenticationHandlerPtr auth_handler;
-    auto* frame = RenderFrameHost::FromID(process_id_, parent_render_frame_id_);
+    auto* frame =
+        RenderFrameHost::FromID(process_id_, ancestor_render_frame_id_);
     if (!frame) {
       // In some cases |frame| can be null. In such cases the worker will
       // soon be terminated too, so let's abort the connection.
@@ -81,13 +84,22 @@ class DedicatedWorkerHost : public service_manager::mojom::InterfaceProvider {
     GetContentClient()->browser()->WillCreateWebSocket(frame, &request,
                                                        &auth_handler);
 
-    WebSocketManager::CreateWebSocket(process_id_, parent_render_frame_id_,
+    WebSocketManager::CreateWebSocket(process_id_, ancestor_render_frame_id_,
                                       origin_, std::move(auth_handler),
                                       std::move(request));
   }
 
+  void CreateDedicatedWorker(
+      blink::mojom::DedicatedWorkerFactoryRequest request) {
+    CreateDedicatedWorkerHostFactory(process_id_, ancestor_render_frame_id_,
+                                     origin_, std::move(request));
+  }
+
   const int process_id_;
-  const int parent_render_frame_id_;
+  // ancestor_render_frame_id_ is the id of the frame that owns this worker,
+  // either directly, or (in the case of nested workers) indirectly via a tree
+  // of dedicated workers.
+  const int ancestor_render_frame_id_;
   const url::Origin origin_;
 
   service_manager::BinderRegistry registry_;
@@ -100,10 +112,10 @@ class DedicatedWorkerHost : public service_manager::mojom::InterfaceProvider {
 class DedicatedWorkerFactoryImpl : public blink::mojom::DedicatedWorkerFactory {
  public:
   DedicatedWorkerFactoryImpl(int process_id,
-                             int parent_render_frame_id,
+                             int ancestor_render_frame_id,
                              const url::Origin& parent_context_origin)
       : process_id_(process_id),
-        parent_render_frame_id_(parent_render_frame_id),
+        ancestor_render_frame_id_(ancestor_render_frame_id),
         parent_context_origin_(parent_context_origin) {}
 
   // blink::mojom::DedicatedWorkerFactory:
@@ -114,7 +126,7 @@ class DedicatedWorkerFactoryImpl : public blink::mojom::DedicatedWorkerFactory {
     // with the request for |DedicatedWorkerFactory|, enforce that the worker's
     // origin either matches the creating document's origin, or is unique.
     mojo::MakeStrongBinding(std::make_unique<DedicatedWorkerHost>(
-                                process_id_, parent_render_frame_id_, origin),
+                                process_id_, ancestor_render_frame_id_, origin),
                             FilterRendererExposedInterfaces(
                                 blink::mojom::kNavigation_DedicatedWorkerSpec,
                                 process_id_, std::move(request)));
@@ -122,7 +134,7 @@ class DedicatedWorkerFactoryImpl : public blink::mojom::DedicatedWorkerFactory {
 
  private:
   const int process_id_;
-  const int parent_render_frame_id_;
+  const int ancestor_render_frame_id_;
   const url::Origin parent_context_origin_;
 
   DISALLOW_COPY_AND_ASSIGN(DedicatedWorkerFactoryImpl);
@@ -132,11 +144,11 @@ class DedicatedWorkerFactoryImpl : public blink::mojom::DedicatedWorkerFactory {
 
 void CreateDedicatedWorkerHostFactory(
     int process_id,
-    int parent_render_frame_id,
+    int ancestor_render_frame_id,
     const url::Origin& origin,
     blink::mojom::DedicatedWorkerFactoryRequest request) {
   mojo::MakeStrongBinding(std::make_unique<DedicatedWorkerFactoryImpl>(
-                              process_id, parent_render_frame_id, origin),
+                              process_id, ancestor_render_frame_id, origin),
                           std::move(request));
 }
 

content/child/runtime_features.cc

@@ -441,6 +441,9 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   WebRuntimeFeatures::EnableOffMainThreadWebSocket(
       base::FeatureList::IsEnabled(features::kOffMainThreadWebSocket));
 
+  WebRuntimeFeatures::EnableNestedWorkers(
+      base::FeatureList::IsEnabled(blink::features::kNestedWorkers));
+
   if (base::FeatureList::IsEnabled(
           features::kExperimentalProductivityFeatures)) {
     WebRuntimeFeatures::EnableExperimentalProductivityFeatures(true);

content/public/app/mojo/content_browser_manifest.json

@@ -222,6 +222,7 @@
         "renderer": [
           "blink.mojom.BudgetService",
           "blink.mojom.CacheStorage",
+          "blink.mojom.DedicatedWorkerFactory",
           "blink.mojom.LockManager",
           "blink.mojom.NotificationService",
           "blink.mojom.PermissionService",

third_party/WebKit/LayoutTests/TestExpectations

@@ -3520,6 +3520,10 @@ crbug.com/655458 external/wpt/workers/interfaces/WorkerGlobalScope/onerror/propa
 crbug.com/655458 external/wpt/workers/interfaces/WorkerUtils/importScripts/006.html [ Failure Timeout ]
 crbug.com/655458 external/wpt/workers/semantics/multiple-workers/007.html [ Timeout ]
 
+# This fails because AllowedByNoSniff::MimeTypeAsScript() blocks the nested worker's
+# worker script, because the script url has a .html file extension.
+crbug.com/655458 external/wpt/workers/semantics/multiple-workers/003.html [ Timeout ]
+
 crbug.com/490511 external/wpt/html/semantics/embedded-content/media-elements/playing-the-media-resource/pause-remove-from-document-networkState.html [ Timeout ]
 
 crbug.com/435547 http/tests/cachestorage/serviceworker/ignore-search-with-credentials.html [ Skip ]

third_party/WebKit/LayoutTests/VirtualTestSuites

@@ -612,17 +612,17 @@
   {
     "prefix": "off-main-thread-websocket",
     "base": "external/wpt/websockets",
-    "args": ["--disable-features=OffMainThreadWebSocket"]
+    "args": ["--disable-features=OffMainThreadWebSocket,NestedWorkers"]
   },
   {
     "prefix": "off-main-thread-websocket",
     "base": "http/tests/websocket",
-    "args": ["--disable-features=OffMainThreadWebSocket"]
+    "args": ["--disable-features=OffMainThreadWebSocket,NestedWorkers"]
   },
   {
     "prefix": "off-main-thread-websocket",
     "base": "http/tests/security/mixedContent/websocket",
-    "args": ["--disable-features=OffMainThreadWebSocket"]
+    "args": ["--disable-features=OffMainThreadWebSocket,NestedWorkers"]
   },
   {
     "prefix": "webrtc-wpt-unified-plan",

third_party/WebKit/LayoutTests/external/wpt/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/nested-worker-success-dedicatedworker-expected.txt

 This is a testharness.js-based test.
-FAIL postMessaging to a dedicated sub-worker allows them to see each others' modifications Worker is not defined
+FAIL postMessaging to a dedicated sub-worker allows them to see each others' modifications promise_test: Unhandled rejection with value: object "ReferenceError: SharedArrayBuffer is not defined"
 Harness: the test ran to completion.
 

third_party/WebKit/LayoutTests/external/wpt/html/infrastructure/urls/resolving-urls/query-encoding/utf-8-expected.txt

 This is a testharness.js-based test.
-Found 101 tests; 60 PASS, 41 FAIL, 0 TIMEOUT, 0 NOTRUN.
+Found 101 tests; 61 PASS, 40 FAIL, 0 TIMEOUT, 0 NOTRUN.
 PASS load nested browsing context <frame src>
 PASS load nested browsing context <iframe src>
 PASS load nested browsing context <object data>
@@ -36,7 +36,7 @@ FAIL SVG <image> poll_for_stash is not defined
 FAIL SVG <use> poll_for_stash is not defined
 PASS XMLHttpRequest#open()
 PASS importScripts() in a dedicated worker
-FAIL Worker() in a dedicated worker assert_equals: expected "%C3%A5" but got "ReferenceError: Worker is not defined"
+PASS Worker() in a dedicated worker
 FAIL SharedWorker() in a dedicated worker assert_equals: expected "%C3%A5" but got "ReferenceError: SharedWorker is not defined"
 FAIL importScripts() in a shared worker assert_equals: expected "%C3%A5" but got "importScripts failed to run"
 FAIL Worker() in a shared worker assert_equals: expected "%C3%A5" but got "ReferenceError: Worker is not defined"

third_party/WebKit/LayoutTests/external/wpt/html/infrastructure/urls/resolving-urls/query-encoding/windows-1251-expected.txt

 This is a testharness.js-based test.
-Found 101 tests; 50 PASS, 51 FAIL, 0 TIMEOUT, 0 NOTRUN.
+Found 101 tests; 51 PASS, 50 FAIL, 0 TIMEOUT, 0 NOTRUN.
 PASS load nested browsing context <frame src>
 PASS load nested browsing context <iframe src>
 PASS load nested browsing context <object data>
@@ -36,7 +36,7 @@ FAIL SVG <image> poll_for_stash is not defined
 FAIL SVG <use> poll_for_stash is not defined
 FAIL XMLHttpRequest#open() assert_equals: expected "%C3%A5" but got "%26%23229%3B"
 PASS importScripts() in a dedicated worker
-FAIL Worker() in a dedicated worker assert_equals: expected "%C3%A5" but got "ReferenceError: Worker is not defined"
+PASS Worker() in a dedicated worker
 FAIL SharedWorker() in a dedicated worker assert_equals: expected "%C3%A5" but got "ReferenceError: SharedWorker is not defined"
 FAIL importScripts() in a shared worker assert_equals: expected "%C3%A5" but got "importScripts failed to run"
 FAIL Worker() in a shared worker assert_equals: expected "%C3%A5" but got "ReferenceError: Worker is not defined"

third_party/WebKit/LayoutTests/external/wpt/html/infrastructure/urls/resolving-urls/query-encoding/windows-1252-expected.txt

 This is a testharness.js-based test.
-Found 101 tests; 53 PASS, 48 FAIL, 0 TIMEOUT, 0 NOTRUN.
+Found 101 tests; 54 PASS, 47 FAIL, 0 TIMEOUT, 0 NOTRUN.
 PASS load nested browsing context <frame src>
 PASS load nested browsing context <iframe src>
 PASS load nested browsing context <object data>
@@ -36,7 +36,7 @@ FAIL SVG <image> poll_for_stash is not defined
 FAIL SVG <use> poll_for_stash is not defined
 FAIL XMLHttpRequest#open() assert_equals: expected "%C3%A5" but got "%E5"
 PASS importScripts() in a dedicated worker
-FAIL Worker() in a dedicated worker assert_equals: expected "%C3%A5" but got "ReferenceError: Worker is not defined"
+PASS Worker() in a dedicated worker
 FAIL SharedWorker() in a dedicated worker assert_equals: expected "%C3%A5" but got "ReferenceError: SharedWorker is not defined"
 FAIL importScripts() in a shared worker assert_equals: expected "%C3%A5" but got "importScripts failed to run"
 FAIL Worker() in a shared worker assert_equals: expected "%C3%A5" but got "ReferenceError: Worker is not defined"

third_party/WebKit/LayoutTests/external/wpt/secure-contexts/basic-dedicated-worker-expected.txt

 This is a testharness.js-based test.
 PASS HTTP worker
 PASS HTTPS worker
-FAIL HTTP nested worker assert_false: expected false got "Nested workers not supported."
+PASS HTTP nested worker
 PASS HTTPS nested worker
 PASS HTTP worker from HTTPS subframe
 FAIL HTTPS worker from HTTPS subframe assert_false: expected false got true

third_party/WebKit/LayoutTests/external/wpt/secure-contexts/basic-dedicated-worker.https-expected.txt

-This is a testharness.js-based test.
-PASS HTTP worker
-PASS HTTPS worker
-PASS HTTP nested worker
-FAIL HTTPS nested worker assert_true: expected true got "Nested workers not supported."
-PASS HTTP worker from HTTPS subframe
-PASS HTTPS worker from HTTPS subframe
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/claim-worker-fetch.https-expected.txt

-This is a testharness.js-based test.
-PASS fetch() in Worker should be intercepted after the client is claimed.
-FAIL fetch() in nested Worker should be intercepted after the client is claimed. assert_equals: fetch() should not be intercepted. expected "a simple text file\n" but got "Fail: undefined"
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/websockets/Create-on-worker-shutdown.any.worker-expected.txt

 This is a testharness.js-based test.
-FAIL WebSocket created after a worker self.close() Worker is not defined
+FAIL WebSocket created after a worker self.close() assert_equals: Closed WebSocket created on worker shutdown is in closing state. expected 2 but got 3
 Harness: the test ran to completion.
 

third_party/WebKit/LayoutTests/external/wpt/workers/constructors/Worker/expected-self-properties.worker-expected.txt

@@ -3,7 +3,7 @@ PASS existence of XMLHttpRequest
 PASS existence of WebSocket
 PASS existence of EventSource
 PASS existence of MessageChannel
-FAIL existence of Worker assert_true: expected true got false
+PASS existence of Worker
 FAIL existence of SharedWorker assert_true: expected true got false
 Harness: the test ran to completion.
 

third_party/WebKit/LayoutTests/external/wpt/workers/modules/dedicated-worker-import-blob-url.any.worker-expected.txt

-This is a testharness.js-based test.
-FAIL Static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Nested static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Static import and then dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Nested dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Dynamic import and then static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL eval(import()). promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/workers/modules/dedicated-worker-import-data-url.any.worker-expected.txt

-This is a testharness.js-based test.
-FAIL Static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Nested static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Static import and then dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Nested dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Dynamic import and then static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL eval(import()). promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/workers/modules/dedicated-worker-import.any.worker-expected.txt

-This is a testharness.js-based test.
-FAIL Static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Nested static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Static import and then dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Nested dynamic import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL Dynamic import and then static import. promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-FAIL eval(import()). promise_test: Unhandled rejection with value: object "ReferenceError: Worker is not defined"
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/workers/nested_worker.worker-expected.txt

-This is a testharness.js-based test.
-FAIL Nested worker Worker is not defined
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/workers/nested_worker_close_from_parent_worker-expected.txt

-This is a testharness.js-based test.
-FAIL Test terminating a nested workers by calling terminate() from its parent worker assert_equals: expected "Pass" but got "Fail: ReferenceError: Worker is not defined"
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/workers/nested_worker_sync_xhr.worker-expected.txt

-This is a testharness.js-based test.
-FAIL Nested worker that issues a sync XHR Worker is not defined
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/workers/nested_worker_terminate_from_document-expected.txt

-This is a testharness.js-based test.
-FAIL Test terminating a chain of nested workers by calling terminate() from the owning document assert_equals: expected "Pass" but got "Fail: ReferenceError: Worker is not defined"
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/workers/semantics/interface-objects/001.worker-expected.txt

 This is a testharness.js-based test.
-Found 61 tests; 57 PASS, 4 FAIL, 0 TIMEOUT, 0 NOTRUN.
+Found 61 tests; 58 PASS, 3 FAIL, 0 TIMEOUT, 0 NOTRUN.
 PASS The WorkerGlobalScope interface object should be exposed.
 PASS The DedicatedWorkerGlobalScope interface object should be exposed.
-FAIL The Worker interface object should be exposed. assert_own_property: expected property "Worker" missing
+PASS The Worker interface object should be exposed.
 FAIL The SharedWorker interface object should be exposed. assert_own_property: expected property "SharedWorker" missing
 PASS The MessagePort interface object should be exposed.
 PASS The MessageEvent interface object should be exposed.

third_party/WebKit/LayoutTests/http/tests/devtools/console/nested-worker-eval-contains-stack-expected.txt

+Tests exception message from eval on nested worker context in console contains stack trace.
+
+            function foo()
+            {
+                throw {a:239};
+            }
+            function boo()
+            {
+                foo();
+            }
+            boo();
+VM:3 Uncaught {a: 239}a: 239__proto__: Object
+foo @ VM:3
+boo @ VM:7
+(anonymous) @ VM:9
+

third_party/WebKit/LayoutTests/http/tests/devtools/console/nested-worker-eval-contains-stack.js

+(async function() {
+  TestRunner.addResult(`Tests exception message from eval on nested worker context in console contains stack trace.\n`);
+  await TestRunner.loadModule('console_test_runner');
+  await TestRunner.showPanel('console');
+  await TestRunner.evaluateInPagePromise(`
+      function startWorker()
+      {
+          var worker = new Worker("resources/nested-worker.js");
+      }
+  `);
+
+  TestRunner.addSniffer(SDK.RuntimeModel.prototype, '_executionContextCreated', contextCreated);
+  TestRunner.evaluateInPage('startWorker()');
+
+  var contexts_still_loading = 2;
+  function contextCreated() {
+    contexts_still_loading--;
+    if (contexts_still_loading > 0) {
+      TestRunner.addSniffer(SDK.RuntimeModel.prototype, '_executionContextCreated', contextCreated);
+      return;
+    }
+
+    ConsoleTestRunner.changeExecutionContext('\u2699 worker.js');
+    ConsoleTestRunner.evaluateInConsole('\
+            function foo()\n\
+            {\n\
+                throw {a:239};\n\
+            }\n\
+            function boo()\n\
+            {\n\
+                foo();\n\
+            }\n\
+            boo();', step2);
+  }
+
+  function step2() {
+    ConsoleTestRunner.expandConsoleMessages(step3);
+  }
+
+  function step3() {
+    ConsoleTestRunner.dumpConsoleMessages();
+    TestRunner.completeTest();
+  }
+})();

third_party/WebKit/LayoutTests/http/tests/devtools/console/resources/nested-worker.js

+nested = new Worker("worker.js");

third_party/WebKit/LayoutTests/external/wpt/workers/nested_worker_importScripts.worker-expected.txt → third_party/WebKit/LayoutTests/virtual/off-main-thread-websocket/external/wpt/websockets/Create-on-worker-shutdown.any.worker-expected.txt

 This is a testharness.js-based test.
-FAIL Nested worker that calls importScripts() Worker is not defined
+FAIL WebSocket created after a worker self.close() Worker is not defined
 Harness: the test ran to completion.
 

third_party/WebKit/LayoutTests/external/wpt/workers/nested_worker_close_self.worker-expected.txt → third_party/WebKit/LayoutTests/virtual/sharedarraybuffer/external/wpt/html/infrastructure/safe-passing-of-structured-data/shared-array-buffers/nested-worker-success-dedicatedworker-expected.txt

 This is a testharness.js-based test.
-FAIL Nested work that closes itself Worker is not defined
+PASS postMessaging to a dedicated sub-worker allows them to see each others' modifications
 Harness: the test ran to completion.
 

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-dedicated-worker-expected.txt

@@ -3120,6 +3120,15 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     setter onerror
 [Worker]     setter onmessage
 [Worker]     setter onopen
+[Worker] interface Worker : EventTarget
+[Worker]     attribute @@toStringTag
+[Worker]     getter onerror
+[Worker]     getter onmessage
+[Worker]     method constructor
+[Worker]     method postMessage
+[Worker]     method terminate
+[Worker]     setter onerror
+[Worker]     setter onmessage
 [Worker] interface WorkerGlobalScope : EventTarget
 [Worker]     attribute @@toStringTag
 [Worker]     getter caches

third_party/WebKit/LayoutTests/webexposed/global-interface-listing-dedicated-worker-expected.txt

@@ -3376,6 +3376,15 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     setter onerror
 [Worker]     setter onmessage
 [Worker]     setter onopen
+[Worker] interface Worker : EventTarget
+[Worker]     attribute @@toStringTag
+[Worker]     getter onerror
+[Worker]     getter onmessage
+[Worker]     method constructor
+[Worker]     method postMessage
+[Worker]     method terminate
+[Worker]     setter onerror
+[Worker]     setter onmessage
 [Worker] interface WorkerGlobalScope : EventTarget
 [Worker]     attribute @@toStringTag
 [Worker]     getter caches

third_party/blink/common/features.cc

@@ -21,6 +21,10 @@ const base::Feature kLayoutNG{"LayoutNG", base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kMojoBlobURLs{"MojoBlobURLs",
                                   base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Nested workers. See https://crbug.com/31666
+const base::Feature kNestedWorkers{"NestedWorkers",
+                                   base::FEATURE_ENABLED_BY_DEFAULT};
+
 // Enable new service worker glue for NetworkService. Can be
 // enabled independently of NetworkService.
 const base::Feature kServiceWorkerServicification{

third_party/blink/public/common/features.h

@@ -16,6 +16,7 @@ BLINK_COMMON_EXPORT extern const base::Feature
 BLINK_COMMON_EXPORT extern const base::Feature kLayoutNG;
 BLINK_COMMON_EXPORT extern const base::Feature kMojoBlobURLs;
 BLINK_COMMON_EXPORT extern const base::Feature kServiceWorkerServicification;
+BLINK_COMMON_EXPORT extern const base::Feature kNestedWorkers;
 
 }  // namespace features
 }  // namespace blink

third_party/blink/public/platform/web_runtime_features.h

@@ -104,6 +104,7 @@ class WebRuntimeFeatures {
   BLINK_PLATFORM_EXPORT static void EnableModuleScriptsDynamicImport(bool);
   BLINK_PLATFORM_EXPORT static void EnableModuleScriptsImportMetaUrl(bool);
   BLINK_PLATFORM_EXPORT static void EnableNavigatorContentUtils(bool);
+  BLINK_PLATFORM_EXPORT static void EnableNestedWorkers(bool);
   BLINK_PLATFORM_EXPORT static void EnableNetInfoDownlinkMax(bool);
   BLINK_PLATFORM_EXPORT static void EnableNetworkService(bool);
   BLINK_PLATFORM_EXPORT static void EnableNotificationConstructor(bool);

third_party/blink/renderer/core/workers/worker.idl

@@ -31,7 +31,7 @@
     ActiveScriptWrappable,
     Constructor(DOMString scriptURL, optional WorkerOptions options),
     ConstructorCallWith=ExecutionContext,
-    // TODO(foolip): Exposed=(Window,Worker),
+    Exposed(Window StableBlinkFeatures,DedicatedWorker NestedWorkers),
     RaisesException=Constructor,
     ImplementedAs=DedicatedWorker
 ] interface Worker : EventTarget {

third_party/blink/renderer/platform/exported/web_runtime_features.cc

@@ -228,6 +228,10 @@ void WebRuntimeFeatures::EnableNavigatorContentUtils(bool enable) {
   RuntimeEnabledFeatures::SetNavigatorContentUtilsEnabled(enable);
 }
 
+void WebRuntimeFeatures::EnableNestedWorkers(bool enable) {
+  RuntimeEnabledFeatures::SetNestedWorkersEnabled(enable);
+}
+
 void WebRuntimeFeatures::EnableNetInfoDownlinkMax(bool enable) {
   RuntimeEnabledFeatures::SetNetInfoDownlinkMaxEnabled(enable);
 }

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -793,6 +793,10 @@
       name: "NavigatorDeviceMemory",
       status: "stable",
     },
+    {
+      name: "NestedWorkers",
+      status: "stable",
+    },
     {
       name: "NetInfoDownlink",
       status: "stable",