Experimental (somewhat): Force GCs when disposing contexts.

src/api.cc

Index: src/api.cc
===================================================================
--- src/api.cc	(revision 1364)
+++ src/api.cc	(working copy)
@@ -376,7 +376,9 @@
 void V8::DisposeGlobal(void** obj) {
   LOG_API("DisposeGlobal");
   if (has_shut_down) return;
-  i::GlobalHandles::Destroy(reinterpret_cast<i::Object**>(obj));
+  i::Object** ptr = reinterpret_cast<i::Object**>(obj);
+  if ((*ptr)->IsGlobalContext()) i::Heap::NotifyContextDisposed();
+  i::GlobalHandles::Destroy(ptr);
 }
 
 // --- H a n d l e s ---
@@ -2207,6 +2209,9 @@
   LOG_API("Context::New");
   ON_BAILOUT("v8::Context::New()", return Persistent<Context>());
 
+  // Give the heap a chance to cleanup if we've disposed contexts.
+  i::Heap::CollectAllGarbageIfContextDisposed();
+
   v8::Handle<ObjectTemplate> proxy_template = global_template;
   i::Handle<i::FunctionTemplateInfo> proxy_constructor;
   i::Handle<i::FunctionTemplateInfo> global_constructor;