[Worklets] Add basic debugging to main thread worklets.

third_party/WebKit/Source/bindings/core/v8/BindingSecurity.cpp

Index: third_party/WebKit/Source/bindings/core/v8/BindingSecurity.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/BindingSecurity.cpp b/third_party/WebKit/Source/bindings/core/v8/BindingSecurity.cpp
index 66d06a05a9b42d0b85681c419c004962bee4e494..911b5107aec495da17d01d06d2b60363ea300d98 100644
--- a/third_party/WebKit/Source/bindings/core/v8/BindingSecurity.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/BindingSecurity.cpp
@@ -36,6 +36,7 @@
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameElementBase.h"
+#include "core/workers/MainThreadWorkletGlobalScope.h"
 #include "platform/weborigin/SecurityOrigin.h"
 
 namespace blink {
@@ -121,6 +122,15 @@ bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWi
     return canAccessFrame(isolate, accessingWindow, frame->securityContext()->securityOrigin(), frame->domWindow(), reportingOption);
 }
 
+bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const MainThreadWorkletGlobalScope* target, SecurityReportingOption reportingOption)
+{
+    ASSERT(target);
+    const Frame* frame = target->frame();
+    if (!frame || !frame->securityContext())
+        return false;
+    return canAccessFrame(isolate, accessingWindow, frame->securityContext()->securityOrigin(), frame->domWindow(), reportingOption);
+}
+
 bool BindingSecurity::shouldAllowAccessTo(v8::Isolate* isolate, const LocalDOMWindow* accessingWindow, const Node* target, ExceptionState& exceptionState)
 {
     if (!target)