Add API function Dart_ZoneAllocate

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index ecf07cf967a51e0faf122ea65c30c0169527d7a1..4e879940f36c15ae528ffb737537fbdaff49de56 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -224,7 +224,7 @@ uword Api::Allocate(intptr_t size) {
   ASSERT(state != NULL);
   ApiLocalScope* scope = state->top_scope();
   ASSERT(scope != NULL);
-  return scope->zone().Allocate(size);
+  return scope->zone()->Allocate(size);
 }
 
 
@@ -235,7 +235,7 @@ uword Api::Reallocate(uword ptr, intptr_t old_size, intptr_t new_size) {
   ASSERT(state != NULL);
   ApiLocalScope* scope = state->top_scope();
   ASSERT(scope != NULL);
-  return scope->zone().Reallocate(ptr, old_size, new_size);
+  return scope->zone()->Reallocate(ptr, old_size, new_size);
 }
 
 
@@ -2694,4 +2694,21 @@ DART_EXPORT void Dart_GetPprofSymbolInfo(void** buffer, int* buffer_size) {
   }
 }
 
+
+DART_EXPORT uint8_t* Dart_ZoneAllocate(intptr_t size) {
+  ApiZone* zone;
+  Isolate* isolate = Isolate::Current();
+  if (isolate != NULL) {
+    ApiState* state = isolate->api_state();
+    if (state == NULL) return NULL;
+    ApiLocalScope* scope = state->top_scope();
+    zone = scope->zone();
+  } else {
+    ApiNativeScope* scope = ApiNativeScope::Current();
+    if (scope == NULL) return NULL;
+    zone = scope->zone();
+  }
+  return reinterpret_cast<uint8_t*>(zone->Allocate(size));
+}
+
 }  // namespace dart