Introduce V8GCController::collectAllGarbage

Source/bindings/core/v8/V8GCController.cpp

Index: Source/bindings/core/v8/V8GCController.cpp
diff --git a/Source/bindings/core/v8/V8GCController.cpp b/Source/bindings/core/v8/V8GCController.cpp
index 3ff9478cb22f9758b5368984a131205a6bbec904..ced20383ae5b60ce01b725ca30c8a50e10bf1b31 100644
--- a/Source/bindings/core/v8/V8GCController.cpp
+++ b/Source/bindings/core/v8/V8GCController.cpp
@@ -482,6 +482,12 @@ void V8GCController::collectGarbage(v8::Isolate* isolate)
     scriptState->disposePerContextData();
 }
 
+void V8GCController::collectAllGarbageForTesting(v8::Isolate* isolate)
+{
+    for (unsigned i = 0; i < 5; i++)
+        isolate->RequestGarbageCollectionForTesting(v8::Isolate::kFullGarbageCollection);
+}
+
 void V8GCController::reportDOMMemoryUsageToV8(v8::Isolate* isolate)
 {
     if (!isMainThread())