Worklet: Introduce "pending tasks struct" concept defined in the Worklet spec

This is split from https://codereview.chromium.org/2840523002/

This CL introduces "pending tasks struct" concept defined in the Worklet spec:
https://drafts.css-houdini.org/worklets/#pending-tasks-struct

The pending tasks struct is used as a kind of barrier closure: when
Worklet::addModule() is called, multiple WorkletGlobalScopes associated with the
Worklet may start module loading. The struct waits until they all are completed
and then resolves a promise. If one of them is failed, the struct immediately
rejects a promise and ignores following completions.

This CL also removes WorkletObjectProxy and the request id mechanism in
MainThreadWorklet using the pending tasks struct.

BUG=627945

Review-Url: https://codereview.chromium.org/2839123003
Cr-Commit-Position: refs/heads/master@{#467908}

third_party/WebKit/Source/core/loader/WorkletScriptLoader.h

@@ -54,9 +54,6 @@ class WorkletScriptLoader final
   // after Client::notifyWorkletScriptLoadingFinished() is called.
   bool WasScriptLoadSuccessful() const;
 
-  void set_request_id(int32_t request_id) { request_id_ = request_id; }
-  int32_t request_id() const { return request_id_; }
-
   DECLARE_TRACE();
 
  private:
@@ -69,10 +66,6 @@ class WorkletScriptLoader final
   Member<ResourceFetcher> fetcher_;
   Member<Client> client_;
 
-  // The client of this loader can freely use this field to identify a fetch
-  // request.
-  int32_t request_id_ = -1;
-
   bool was_script_load_successful_ = false;
   bool was_script_load_complete_ = false;
 };

third_party/WebKit/Source/core/workers/BUILD.gn

@@ -84,7 +84,8 @@ blink_core_sources("workers") {
     "WorkletGlobalScope.cpp",
     "WorkletGlobalScope.h",
     "WorkletGlobalScopeProxy.h",
-    "WorkletObjectProxy.h",
+    "WorkletPendingTasks.cpp",
+    "WorkletPendingTasks.h",
     "WorkletThreadHolder.h",
   ]
 

third_party/WebKit/Source/core/workers/MainThreadWorklet.cpp

@@ -11,27 +11,17 @@
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
 #include "core/workers/WorkletGlobalScopeProxy.h"
+#include "core/workers/WorkletPendingTasks.h"
 #include "platform/wtf/WTF.h"
 
 namespace blink {
 
-namespace {
-
-int32_t GetNextRequestId() {
-  DCHECK(IsMainThread());
-  static int32_t next_request_id = 1;
-  CHECK_LT(next_request_id, std::numeric_limits<int32_t>::max());
-  return next_request_id++;
-}
-
-}  // namespace
-
-MainThreadWorklet::MainThreadWorklet(LocalFrame* frame) : Worklet(frame) {
-  DCHECK(resolver_map_.IsEmpty());
-}
+MainThreadWorklet::MainThreadWorklet(LocalFrame* frame) : Worklet(frame) {}
 
+// Implementation of the "addModule(moduleURL, options)" algorithm:
+// https://drafts.css-houdini.org/worklets/#dom-worklet-addmodule
 ScriptPromise MainThreadWorklet::addModule(ScriptState* script_state,
-                                           const String& url) {
+                                           const String& module_url) {
   DCHECK(IsMainThread());
   if (!GetExecutionContext()) {
     return ScriptPromise::RejectWithDOMException(
@@ -39,44 +29,44 @@ ScriptPromise MainThreadWorklet::addModule(ScriptState* script_state,
                                            "This frame is already detached"));
   }
 
-  KURL script_url = GetExecutionContext()->CompleteURL(url);
-  if (!script_url.IsValid()) {
+  KURL module_url_record = GetExecutionContext()->CompleteURL(module_url);
+  if (!module_url_record.IsValid()) {
     return ScriptPromise::RejectWithDOMException(
-        script_state, DOMException::Create(
-                          kSyntaxError, "'" + url + "' is not a valid URL."));
+        script_state,
+        DOMException::Create(kSyntaxError,
+                             "'" + module_url + "' is not a valid URL."));
   }
 
-  int32_t request_id = GetNextRequestId();
   ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);
   ScriptPromise promise = resolver->Promise();
-  resolver_map_.Set(request_id, resolver);
-  GetWorkletGlobalScopeProxy()->FetchAndInvokeScript(request_id, script_url);
-  return promise;
-}
 
-void MainThreadWorklet::DidFetchAndInvokeScript(int32_t request_id,
-                                                bool success) {
-  DCHECK(IsMainThread());
-  ScriptPromiseResolver* resolver = resolver_map_.at(request_id);
-  if (!resolver)
-    return;
-  resolver_map_.erase(request_id);
-  if (!success) {
-    resolver->Reject(DOMException::Create(kNetworkError));
-    return;
-  }
-  resolver->Resolve();
+  // Step 11: "Let pendingTaskStruct be a new pending tasks struct with counter
+  // initialized to the length of worklet's WorkletGlobalScopes."
+  // TODO(nhiroki): Introduce the concept of "worklet's WorkletGlobalScopes" and
+  // use the length of it here.
+  constexpr int number_of_global_scopes = 1;
+  WorkletPendingTasks* pending_tasks =
+      new WorkletPendingTasks(number_of_global_scopes, resolver);
+
+  // Step 12: "For each workletGlobalScope in the worklet's
+  // WorkletGlobalScopes, queue a task on the workletGlobalScope to fetch and
+  // invoke a worklet script given workletGlobalScope, moduleURLRecord,
+  // moduleResponsesMap, credentialOptions, outsideSettings, pendingTaskStruct,
+  // and promise."
+  // TODO(nhiroki): Pass the remaining parameters (e.g., credentialOptions).
+  // TODO(nhiroki): Queue a task instead of executing this here.
+  GetWorkletGlobalScopeProxy()->FetchAndInvokeScript(module_url_record,
+                                                     pending_tasks);
+  return promise;
 }
 
 void MainThreadWorklet::ContextDestroyed(ExecutionContext* execution_context) {
   DCHECK(IsMainThread());
-  resolver_map_.clear();
   GetWorkletGlobalScopeProxy()->TerminateWorkletGlobalScope();
   Worklet::ContextDestroyed(execution_context);
 }
 
 DEFINE_TRACE(MainThreadWorklet) {
-  visitor->Trace(resolver_map_);
   Worklet::Trace(visitor);
 }
 

third_party/WebKit/Source/core/workers/MainThreadWorklet.h

@@ -9,7 +9,6 @@
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/CoreExport.h"
-#include "core/workers/WorkletObjectProxy.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
@@ -20,8 +19,7 @@ class LocalFrame;
 // TODO(nhiroki): This is a temporary class to support module loading for main
 // thread worklets. This and ThreadedWorklet will be merged into the base
 // Worklet class once threaded worklets are ready to use module loading.
-class CORE_EXPORT MainThreadWorklet : public Worklet,
-                                      public WorkletObjectProxy {
+class CORE_EXPORT MainThreadWorklet : public Worklet {
   USING_GARBAGE_COLLECTED_MIXIN(MainThreadWorklet);
   WTF_MAKE_NONCOPYABLE(MainThreadWorklet);
 
@@ -29,22 +27,15 @@ class CORE_EXPORT MainThreadWorklet : public Worklet,
   virtual ~MainThreadWorklet() = default;
 
   // Worklet
-  ScriptPromise addModule(ScriptState*, const String& url) final;
+  ScriptPromise addModule(ScriptState*, const String& module_url) final;
 
   // ContextLifecycleObserver
   void ContextDestroyed(ExecutionContext*) final;
 
-  // WorkletObjectProxy
-  void DidFetchAndInvokeScript(int32_t request_id, bool success) final;
-
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   explicit MainThreadWorklet(LocalFrame*);
-
- private:
-  HeapHashMap<int32_t /* request_id */, Member<ScriptPromiseResolver>>
-      resolver_map_;
 };
 
 }  // namespace blink

third_party/WebKit/Source/core/workers/MainThreadWorkletGlobalScope.cpp

@@ -19,11 +19,9 @@ MainThreadWorkletGlobalScope::MainThreadWorkletGlobalScope(
     const KURL& url,
     const String& user_agent,
     PassRefPtr<SecurityOrigin> security_origin,
-    v8::Isolate* isolate,
-    WorkletObjectProxy* object_proxy)
+    v8::Isolate* isolate)
     : WorkletGlobalScope(url, user_agent, std::move(security_origin), isolate),
-      ContextClient(frame),
-      object_proxy_(object_proxy) {}
+      ContextClient(frame) {}
 
 MainThreadWorkletGlobalScope::~MainThreadWorkletGlobalScope() {}
 
@@ -48,16 +46,23 @@ WorkerThread* MainThreadWorkletGlobalScope::GetThread() const {
   return nullptr;
 }
 
+// Implementation of the first half of the "fetch and invoke a worklet script"
+// algorithm:
+// https://drafts.css-houdini.org/worklets/#fetch-and-invoke-a-worklet-script
 void MainThreadWorkletGlobalScope::FetchAndInvokeScript(
-    int32_t request_id,
-    const KURL& script_url) {
+    const KURL& module_url_record,
+    WorkletPendingTasks* pending_tasks) {
   DCHECK(IsMainThread());
+  // Step 1: "Let insideSettings be the workletGlobalScope's associated
+  // environment settings object."
+  // Step 2: "Let script by the result of fetch a worklet script given
+  // moduleURLRecord, moduleResponsesMap, credentialOptions, outsideSettings,
+  // and insideSettings when it asynchronously completes."
   // TODO(nhiroki): Replace this with module script loading.
   WorkletScriptLoader* script_loader =
       WorkletScriptLoader::Create(GetFrame()->GetDocument()->Fetcher(), this);
-  script_loader->set_request_id(request_id);
-  loader_set_.insert(script_loader);
-  script_loader->FetchScript(script_url);
+  loader_map_.Set(script_loader, pending_tasks);
+  script_loader->FetchScript(module_url_record);
 }
 
 void MainThreadWorkletGlobalScope::EvaluateScript(
@@ -67,22 +72,47 @@ void MainThreadWorkletGlobalScope::EvaluateScript(
   NOTREACHED();
 }
 
+// TODO(nhiroki): Add tests for termination.
 void MainThreadWorkletGlobalScope::TerminateWorkletGlobalScope() {
-  for (const auto& script_loader : loader_set_)
+  for (auto it = loader_map_.begin(); it != loader_map_.end();) {
+    WorkletScriptLoader* script_loader = it->key;
+    // Cancel() eventually calls NotifyWorkletScriptLoadingFinished() and
+    // removes |it| from |loader_map_|, so increment it in advance.
+    ++it;
     script_loader->Cancel();
+  }
   Dispose();
 }
 
+// Implementation of the second half of the "fetch and invoke a worklet script"
+// algorithm:
+// https://drafts.css-houdini.org/worklets/#fetch-and-invoke-a-worklet-script
 void MainThreadWorkletGlobalScope::NotifyWorkletScriptLoadingFinished(
     WorkletScriptLoader* script_loader,
     const ScriptSourceCode& source_code) {
   DCHECK(IsMainThread());
-  int32_t request_id = script_loader->request_id();
-  loader_set_.erase(script_loader);
-  bool success = script_loader->WasScriptLoadSuccessful();
-  if (success)
-    ScriptController()->Evaluate(source_code);
-  object_proxy_->DidFetchAndInvokeScript(request_id, success);
+  auto it = loader_map_.find(script_loader);
+  DCHECK(it != loader_map_.end());
+  WorkletPendingTasks* pending_tasks = it->value;
+  loader_map_.erase(it);
+
+  if (!script_loader->WasScriptLoadSuccessful()) {
+    // Step 3: "If script is null, then queue a task on outsideSettings's
+    // responsible event loop to run these steps:"
+    // The steps are implemented in WorkletPendingTasks::Abort().
+    // TODO(nhiroki): Queue a task instead of executing this here.
+    pending_tasks->Abort();
+    return;
+  }
+
+  // Step 4: "Run a module script given script."
+  ScriptController()->Evaluate(source_code);
+
+  // Step 5: "Queue a task on outsideSettings's responsible event loop to run
+  // these steps:"
+  // The steps are implemented in WorkletPendingTasks::DecrementCounter().
+  // TODO(nhiroki): Queue a task instead of executing this here.
+  pending_tasks->DecrementCounter();
 }
 
 void MainThreadWorkletGlobalScope::AddConsoleMessage(
@@ -95,8 +125,7 @@ void MainThreadWorkletGlobalScope::ExceptionThrown(ErrorEvent* event) {
 }
 
 DEFINE_TRACE(MainThreadWorkletGlobalScope) {
-  visitor->Trace(loader_set_);
-  visitor->Trace(object_proxy_);
+  visitor->Trace(loader_map_);
   WorkletGlobalScope::Trace(visitor);
   ContextClient::Trace(visitor);
 }

third_party/WebKit/Source/core/workers/MainThreadWorkletGlobalScope.h

@@ -11,7 +11,7 @@
 #include "core/loader/WorkletScriptLoader.h"
 #include "core/workers/WorkletGlobalScope.h"
 #include "core/workers/WorkletGlobalScopeProxy.h"
-#include "core/workers/WorkletObjectProxy.h"
+#include "core/workers/WorkletPendingTasks.h"
 
 namespace blink {
 
@@ -31,8 +31,7 @@ class CORE_EXPORT MainThreadWorkletGlobalScope
                                const KURL&,
                                const String& user_agent,
                                PassRefPtr<SecurityOrigin>,
-                               v8::Isolate*,
-                               WorkletObjectProxy*);
+                               v8::Isolate*);
   ~MainThreadWorkletGlobalScope() override;
   bool IsMainThreadWorkletGlobalScope() const final { return true; }
 
@@ -42,7 +41,8 @@ class CORE_EXPORT MainThreadWorkletGlobalScope
   WorkerThread* GetThread() const final;
 
   // WorkletGlobalScopeProxy
-  void FetchAndInvokeScript(int32_t request_id, const KURL& script_url) final;
+  void FetchAndInvokeScript(const KURL& module_url_record,
+                            WorkletPendingTasks*) final;
   void EvaluateScript(const ScriptSourceCode&) final;
   void TerminateWorkletGlobalScope() final;
 
@@ -57,9 +57,8 @@ class CORE_EXPORT MainThreadWorkletGlobalScope
   DECLARE_VIRTUAL_TRACE();
 
  private:
-  HeapHashSet<Member<WorkletScriptLoader>> loader_set_;
-
-  Member<WorkletObjectProxy> object_proxy_;
+  HeapHashMap<Member<WorkletScriptLoader>, Member<WorkletPendingTasks>>
+      loader_map_;
 };
 
 DEFINE_TYPE_CASTS(MainThreadWorkletGlobalScope,

third_party/WebKit/Source/core/workers/MainThreadWorkletTest.cpp

@@ -11,19 +11,6 @@
 
 namespace blink {
 
-namespace {
-
-class WorkletObjectProxyForTest final
-    : public GarbageCollectedFinalized<WorkletObjectProxyForTest>,
-      public WorkletObjectProxy {
-  USING_GARBAGE_COLLECTED_MIXIN(WorkletObjectProxyForTest);
-
- public:
-  void DidFetchAndInvokeScript(int32_t request_id, bool success) {}
-};
-
-}  // namespace
-
 class MainThreadWorkletTest : public ::testing::Test {
  public:
   void SetUp() override {
@@ -32,8 +19,7 @@ class MainThreadWorkletTest : public ::testing::Test {
     security_origin_ = SecurityOrigin::Create(url);
     global_scope_ = new MainThreadWorkletGlobalScope(
         &page_->GetFrame(), url, "fake user agent", security_origin_.Get(),
-        ToIsolate(page_->GetFrame().GetDocument()),
-        new WorkletObjectProxyForTest);
+        ToIsolate(page_->GetFrame().GetDocument()));
   }
 
   void TearDown() override { global_scope_->TerminateWorkletGlobalScope(); }

third_party/WebKit/Source/core/workers/ThreadedWorklet.h

@@ -34,7 +34,7 @@ class CORE_EXPORT ThreadedWorklet : public Worklet,
   virtual bool IsInitialized() const = 0;
 
   // Worklet
-  ScriptPromise addModule(ScriptState*, const String& url) final;
+  ScriptPromise addModule(ScriptState*, const String& module_url) final;
 
   // WorkletScriptLoader::Client
   void NotifyWorkletScriptLoadingFinished(WorkletScriptLoader*,

third_party/WebKit/Source/core/workers/Worklet.h

@@ -32,7 +32,7 @@ class CORE_EXPORT Worklet : public GarbageCollectedFinalized<Worklet>,
 
   // Worklet.idl
   // addModule() imports ES6 module scripts.
-  virtual ScriptPromise addModule(ScriptState*, const String& url) = 0;
+  virtual ScriptPromise addModule(ScriptState*, const String& module_url) = 0;
 
   // Returns a proxy to WorkletGlobalScope on the context thread.
   virtual WorkletGlobalScopeProxy* GetWorkletGlobalScopeProxy() const = 0;

third_party/WebKit/Source/core/workers/WorkletGlobalScopeProxy.h

@@ -7,11 +7,11 @@
 
 #include "core/CoreExport.h"
 #include "platform/weborigin/KURL.h"
-#include "platform/wtf/text/WTFString.h"
 
 namespace blink {
 
 class ScriptSourceCode;
+class WorkletPendingTasks;
 
 // A proxy to talk to the worklet global scope. The global scope may exist in
 // the main thread or on a different thread.
@@ -21,8 +21,8 @@ class CORE_EXPORT WorkletGlobalScopeProxy {
 
   // Runs the "fetch and invoke a worklet script" algorithm:
   // https://drafts.css-houdini.org/worklets/#fetch-and-invoke-a-worklet-script
-  virtual void FetchAndInvokeScript(int32_t request_id,
-                                    const KURL& script_url) {}
+  virtual void FetchAndInvokeScript(const KURL& module_url_record,
+                                    WorkletPendingTasks*) {}
 
   // Evaluates the given script source code. This should be called only for
   // threaded worklets that still use classic script loading.

third_party/WebKit/Source/core/workers/WorkletObjectProxy.h

-// 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.
-
-#ifndef WorkletObjectProxy_h
-#define WorkletObjectProxy_h
-
-#include "core/CoreExport.h"
-#include "platform/heap/GarbageCollected.h"
-#include "platform/weborigin/KURL.h"
-#include "platform/wtf/text/WTFString.h"
-
-namespace blink {
-
-// A proxy to talk to the Worklet object on the main thread from the worklet
-// global scope that may exist in the main thread or on a different thread.
-class CORE_EXPORT WorkletObjectProxy : public GarbageCollectedMixin {
- public:
-  // Called when the worklet module script is fetched and evaluated. |success|
-  // is true if the sequence is completed without an error.
-  virtual void DidFetchAndInvokeScript(int32_t request_id, bool success) = 0;
-};
-
-}  // namespace blink
-
-#endif  // WorkletObjectProxy_h

third_party/WebKit/Source/core/workers/WorkletPendingTasks.cpp

+// 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 "core/workers/WorkletPendingTasks.h"
+
+#include "core/dom/DOMException.h"
+#include "core/dom/ExceptionCode.h"
+#include "platform/wtf/WTF.h"
+
+namespace blink {
+
+WorkletPendingTasks::WorkletPendingTasks(int counter,
+                                         ScriptPromiseResolver* resolver)
+    : counter_(counter), resolver_(resolver) {
+  DCHECK(IsMainThread());
+}
+
+void WorkletPendingTasks::Abort() {
+  DCHECK(IsMainThread());
+  // Step 3: "If script is null, then queue a task on outsideSettings's
+  // responsible event loop to run these steps:"
+  //   1: "If pendingTaskStruct's counter is not -1, then run these steps:"
+  //     1: "Set pendingTaskStruct's counter to -1."
+  //     2: "Reject promise with an "AbortError" DOMException."
+  if (counter_ != -1) {
+    counter_ = -1;
+    // TODO(nhiroki): This should be kAbortError.
+    resolver_->Reject(DOMException::Create(kNetworkError));
+  }
+}
+
+void WorkletPendingTasks::DecrementCounter() {
+  DCHECK(IsMainThread());
+  // Step 5: "Queue a task on outsideSettings's responsible event loop to run
+  // these steps:"
+  //   1: "If pendingTaskStruct's counter is not -1, then run these steps:"
+  //     1: "Decrement pendingTaskStruct's counter by 1."
+  //     2: "If pendingTaskStruct's counter is 0, then resolve promise."
+  if (counter_ != -1) {
+    --counter_;
+    if (counter_ == 0)
+      resolver_->Resolve();
+  }
+}
+
+}  // namespace blink

third_party/WebKit/Source/core/workers/WorkletPendingTasks.h

+// 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.
+
+#ifndef WorkletPendingTasks_h
+#define WorkletPendingTasks_h
+
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "platform/heap/Heap.h"
+
+namespace blink {
+
+// Implementation of the "pending tasks struct":
+// https://drafts.css-houdini.org/worklets/#pending-tasks-struct
+//
+// This also implements a part of the "fetch and invoke a worklet script"
+// algorithm:
+// https://drafts.css-houdini.org/worklets/#fetch-and-invoke-a-worklet-script
+//
+// All functions must be accessed on the main thread.
+class WorkletPendingTasks final : public GarbageCollected<WorkletPendingTasks> {
+ public:
+  WorkletPendingTasks(int counter, ScriptPromiseResolver*);
+
+  // Sets |counter_| to -1 and rejects the promise.
+  void Abort();
+
+  // Decrements |counter_| and resolves the promise if the counter becomes 0.
+  void DecrementCounter();
+
+  DEFINE_INLINE_VIRTUAL_TRACE() { visitor->Trace(resolver_); }
+
+ private:
+  // The number of pending tasks. -1 indicates these tasks are aborted and
+  // |resolver_| already rejected the promise.
+  int counter_;
+
+  Member<ScriptPromiseResolver> resolver_;
+};
+
+}  // namespace blink
+
+#endif  // WorkletPendingTasks_h

third_party/WebKit/Source/modules/csspaint/PaintWorklet.cpp

@@ -23,8 +23,7 @@ PaintWorklet::PaintWorklet(LocalFrame* frame)
           frame->GetDocument()->Url(),
           frame->GetDocument()->UserAgent(),
           frame->GetDocument()->GetSecurityOrigin(),
-          ToIsolate(frame->GetDocument()),
-          this)) {}
+          ToIsolate(frame->GetDocument()))) {}
 
 PaintWorklet::~PaintWorklet() {}
 

third_party/WebKit/Source/modules/csspaint/PaintWorkletGlobalScope.cpp

@@ -23,12 +23,10 @@ PaintWorkletGlobalScope* PaintWorkletGlobalScope::Create(
     const KURL& url,
     const String& user_agent,
     PassRefPtr<SecurityOrigin> security_origin,
-    v8::Isolate* isolate,
-    WorkletObjectProxy* object_proxy) {
+    v8::Isolate* isolate) {
   PaintWorkletGlobalScope* paint_worklet_global_scope =
       new PaintWorkletGlobalScope(frame, url, user_agent,
-                                  std::move(security_origin), isolate,
-                                  object_proxy);
+                                  std::move(security_origin), isolate);
   paint_worklet_global_scope->ScriptController()->InitializeContextIfNeeded();
   MainThreadDebugger::Instance()->ContextCreated(
       paint_worklet_global_scope->ScriptController()->GetScriptState(),
@@ -42,14 +40,12 @@ PaintWorkletGlobalScope::PaintWorkletGlobalScope(
     const KURL& url,
     const String& user_agent,
     PassRefPtr<SecurityOrigin> security_origin,
-    v8::Isolate* isolate,
-    WorkletObjectProxy* object_proxy)
+    v8::Isolate* isolate)
     : MainThreadWorkletGlobalScope(frame,
                                    url,
                                    user_agent,
                                    std::move(security_origin),
-                                   isolate,
-                                   object_proxy) {}
+                                   isolate) {}
 
 PaintWorkletGlobalScope::~PaintWorkletGlobalScope() {}
 

third_party/WebKit/Source/modules/csspaint/PaintWorkletGlobalScope.h

@@ -27,8 +27,7 @@ class MODULES_EXPORT PaintWorkletGlobalScope final
                                          const KURL&,
                                          const String& user_agent,
                                          PassRefPtr<SecurityOrigin>,
-                                         v8::Isolate*,
-                                         WorkletObjectProxy*);
+                                         v8::Isolate*);
   ~PaintWorkletGlobalScope() override;
   void Dispose() final;
 
@@ -47,8 +46,7 @@ class MODULES_EXPORT PaintWorkletGlobalScope final
                           const KURL&,
                           const String& user_agent,
                           PassRefPtr<SecurityOrigin>,
-                          v8::Isolate*,
-                          WorkletObjectProxy*);
+                          v8::Isolate*);
 
   typedef HeapHashMap<String, Member<CSSPaintDefinition>> DefinitionMap;
   DefinitionMap paint_definitions_;