Bug 1674336 - Add WorkerScope#clearConsoleEvents. r=asuth.

This will be used from the DevTools webconsole to clear events when
the user hits the clear button in the UI.

A test for the console is added in the next patch of the queue.

Differential Revision: https://phabricator.services.mozilla.com/D138314

dom/bindings/Bindings.conf

@@ -1584,7 +1584,7 @@ DOMInterfaces = {
 'WorkerDebuggerGlobalScope': {
     'headerFile': 'mozilla/dom/WorkerScope.h',
     'implicitJSContext': [
-        'dump', 'reportError', 'setConsoleEventHandler',
+        'dump', 'clearConsoleEvents', 'reportError', 'setConsoleEventHandler',
     ],
 },
 

dom/webidl/WorkerDebuggerGlobalScope.webidl

@@ -35,6 +35,9 @@ interface WorkerDebuggerGlobalScope : EventTarget {
   [Throws]
   void setConsoleEventHandler(AnyCallback? handler);
 
+  [Throws]
+  void clearConsoleEvents();
+
   // base64 utility methods
   [Throws]
   DOMString btoa(DOMString btoa);

dom/workers/WorkerScope.cpp

@@ -1253,6 +1253,20 @@ void WorkerDebuggerGlobalScope::RetrieveConsoleEvents(
   console->RetrieveConsoleEvents(aCx, aEvents, aRv);
 }
 
+void WorkerDebuggerGlobalScope::ClearConsoleEvents(JSContext* aCx,
+                                                   ErrorResult& aRv) {
+  WorkerGlobalScope* scope = mWorkerPrivate->GetOrCreateGlobalScope(aCx);
+  if (!scope) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  RefPtr<Console> console = scope->GetConsoleIfExists();
+  if (console) {
+    console->ClearStorage();
+  }
+}
+
 void WorkerDebuggerGlobalScope::SetConsoleEventHandler(JSContext* aCx,
                                                        AnyCallback* aHandler,
                                                        ErrorResult& aRv) {

dom/workers/WorkerScope.h

@@ -489,6 +489,8 @@ class WorkerDebuggerGlobalScope final : public WorkerGlobalScopeBase {
   void RetrieveConsoleEvents(JSContext* aCx, nsTArray<JS::Value>& aEvents,
                              ErrorResult& aRv);
 
+  void ClearConsoleEvents(JSContext* aCx, ErrorResult& aRv);
+
   void SetConsoleEventHandler(JSContext* aCx, AnyCallback* aHandler,
                               ErrorResult& aRv);