Merged: [compile hints magic] Fix origin trial config

A test will be added in a follow-up CL.

Bug: v8:13917, chromium:1459545
(cherry picked from commit 305ebd2)

Change-Id: Iccdc2fad9427c23f684905b0a6092d9985a504a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4670556
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Lutz Vahl <vahl@chromium.org>
Cr-Commit-Position: refs/branch-heads/5845@{#411}
Cr-Branched-From: 5a5dff6-refs/heads/main@{#1160321}

third_party/blink/renderer/bindings/core/v8/v8_initializer.cc

@@ -595,6 +595,16 @@ bool WasmGCEnabledCallback(v8::Local<v8::Context> context) {
   return RuntimeEnabledFeatures::WebAssemblyGCEnabled(execution_context);
 }
 
+bool JavaScriptCompileHintsMagicEnabledCallback(
+    v8::Local<v8::Context> context) {
+  ExecutionContext* execution_context = ToExecutionContext(context);
+  if (!execution_context) {
+    return false;
+  }
+  return RuntimeEnabledFeatures::JavaScriptCompileHintsMagicRuntimeEnabled(
+      execution_context);
+}
+
 v8::MaybeLocal<v8::Promise> HostImportModuleDynamically(
     v8::Local<v8::Context> context,
     v8::Local<v8::Data> v8_host_defined_options,
@@ -705,6 +715,8 @@ void InitializeV8Common(v8::Isolate* isolate) {
   isolate->SetWasmGCEnabledCallback(WasmGCEnabledCallback);
   isolate->SetSharedArrayBufferConstructorEnabledCallback(
       SharedArrayBufferConstructorEnabledCallback);
+  isolate->SetJavaScriptCompileHintsMagicEnabledCallback(
+      JavaScriptCompileHintsMagicEnabledCallback);
   isolate->SetHostImportModuleDynamicallyCallback(HostImportModuleDynamically);
   isolate->SetHostInitializeImportMetaObjectCallback(
       HostGetImportMetaProperties);

third_party/blink/renderer/modules/shared_storage/shared_storage_worklet_global_scope.cc

@@ -334,6 +334,10 @@ bool SharedStorageWorkletGlobalScope::FeatureEnabled(
     return true;
   }
 
+  if (feature == OriginTrialFeature::kJavaScriptCompileHintsMagicRuntime) {
+    return false;
+  }
+
   NOTREACHED_NORETURN() << "Attempted to check OriginTrialFeature: "
                         << static_cast<int32_t>(feature);
 }

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -2073,6 +2073,11 @@
     {
       "name": "IntersectionOptimization",
     },
+    {
+      name: "JavaScriptCompileHintsMagicRuntime",
+      status: "experimental",
+      origin_trial_feature_name: "JavaScriptCompileHintsMagic",
+    },
     {
       name: "KeyboardAccessibleTooltip",
       status: "experimental",