Expose the GC under a name that is less collision prone than window.gc.

src/extensions/gc-extension.cc

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 #include "gc-extension.h"
+#include "platform.h"
 
 namespace v8 {
 namespace internal {
 
-const char* const GCExtension::kSource = "native function gc();";
-
 
 v8::Handle<v8::FunctionTemplate> GCExtension::GetNativeFunction(
     v8::Handle<v8::String> str) {
   return v8::FunctionTemplate::New(GCExtension::GC);
 }
 
 
 v8::Handle<v8::Value> GCExtension::GC(const v8::Arguments& args) {
   if (args[0]->BooleanValue()) {
     HEAP->CollectGarbage(NEW_SPACE, "gc extension");
   } else {
     HEAP->CollectAllGarbage(Heap::kNoGCFlags, "gc extension");
   }
   return v8::Undefined();
 }
 
 
 void GCExtension::Register() {
-  static GCExtension gc_extension;
+  static char buffer[50];
+  Vector<char> temp_vector(buffer, sizeof(buffer));
+  if (FLAG_expose_gc_as != NULL && strlen(FLAG_expose_gc_as) != 0) {
+    OS::SNPrintF(temp_vector, "native function %s();", FLAG_expose_gc_as);
+  } else {
+    OS::SNPrintF(temp_vector, "native function gc();");
+  }
+
+  static GCExtension gc_extension(buffer);
   static v8::DeclareExtension declaration(&gc_extension);
 }
 
 } }  // namespace v8::internal