[POC] Implement "module responses map" concept

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

Index: third_party/WebKit/Source/core/workers/MainThreadWorkletGlobalScope.cpp
diff --git a/third_party/WebKit/Source/core/workers/MainThreadWorkletGlobalScope.cpp b/third_party/WebKit/Source/core/workers/MainThreadWorkletGlobalScope.cpp
index 20ca6dd8fccab2bdda0176d22eb0d178b79b6b77..776998542d71ed8100dd9a35004565698fe5c11a 100644
--- a/third_party/WebKit/Source/core/workers/MainThreadWorkletGlobalScope.cpp
+++ b/third_party/WebKit/Source/core/workers/MainThreadWorkletGlobalScope.cpp
@@ -8,12 +8,14 @@
 #include "bindings/core/v8/WorkerOrWorkletScriptController.h"
 #include "core/dom/Document.h"
 #include "core/dom/Modulator.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/frame/Deprecation.h"
 #include "core/frame/FrameConsole.h"
 #include "core/frame/LocalFrame.h"
 #include "core/inspector/MainThreadDebugger.h"
 #include "core/loader/modulescript/ModuleScriptFetchRequest.h"
 #include "core/probe/CoreProbes.h"
+#include "core/workers/WorkletModuleResponsesMap.h"
 #include "core/workers/WorkletModuleTreeClient.h"
 #include "public/platform/WebURLRequest.h"
 
@@ -58,10 +60,17 @@ WorkerThread* MainThreadWorkletGlobalScope::GetThread() const {
 // https://drafts.css-houdini.org/worklets/#fetch-and-invoke-a-worklet-script
 void MainThreadWorkletGlobalScope::FetchAndInvokeScript(
     const KURL& module_url_record,
+    WorkletModuleResponsesMap* module_responses_map,
     WebURLRequest::FetchCredentialsMode credentials_mode,
     RefPtr<WebTaskRunner> outside_settings_task_runner,
     WorkletPendingTasks* pending_tasks) {
   DCHECK(IsMainThread());
+  if (!module_responses_map_proxy_) {
+    module_responses_map_proxy_ = new WorkletModuleResponsesMapProxy(
+        module_responses_map, outside_settings_task_runner,
+        TaskRunnerHelper::Get(TaskType::kUnspecedLoading, this));
+  }
+
   // 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
@@ -85,6 +94,12 @@ void MainThreadWorkletGlobalScope::Terminate() {
   Dispose();
 }
 
+WorkletModuleResponsesMapProxy*
+MainThreadWorkletGlobalScope::GetModuleResponsesMapProxy() const {
+  DCHECK(module_responses_map_proxy_);
+  return module_responses_map_proxy_;
+}
+
 void MainThreadWorkletGlobalScope::AddConsoleMessage(
     ConsoleMessage* console_message) {
   GetFrame()->Console().AddMessage(console_message);
@@ -99,6 +114,7 @@ CoreProbeSink* MainThreadWorkletGlobalScope::GetProbeSink() {
 }
 
 DEFINE_TRACE(MainThreadWorkletGlobalScope) {
+  visitor->Trace(module_responses_map_proxy_);
   WorkletGlobalScope::Trace(visitor);
   ContextClient::Trace(visitor);
 }