Adds an API for setting the stack limit per-thread.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 5b473c9ad9c0016514045202224b5d07463cf9f1..12d50f2bd7126f35d8a4d10180a363382fac4b8c 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -334,21 +334,19 @@ v8::Handle<Boolean> False() {
 }
 
 
-ResourceConstraints::ResourceConstraints()
+HeapResourceConstraints::HeapResourceConstraints()
   : max_young_space_size_(0),
-    max_old_space_size_(0),
-    stack_limit_(NULL) { }
+    max_old_space_size_(0) { }
 
 
-bool SetResourceConstraints(ResourceConstraints* constraints) {
-  bool result = i::Heap::ConfigureHeap(constraints->max_young_space_size(),
-                                       constraints->max_old_space_size());
-  if (!result) return false;
-  if (constraints->stack_limit() != NULL) {
-    uintptr_t limit = reinterpret_cast<uintptr_t>(constraints->stack_limit());
-    i::StackGuard::SetStackLimit(limit);
-  }
-  return true;
+bool SetHeapResourceConstraints(HeapResourceConstraints* constraints) {
+  return i::Heap::ConfigureHeap(constraints->max_young_space_size(),
+                                constraints->max_old_space_size());
+}
+
+
+void SetStackLimit(uint32_t* limit) {
+  i::StackGuard::SetStackLimit(reinterpret_cast<uintptr_t>(limit));
 }