Add option to gen_snapshot for creating a Makefile describing a snapshot's dependencies.

runtime/vm/dart_api_state.h

Index: runtime/vm/dart_api_state.h
diff --git a/runtime/vm/dart_api_state.h b/runtime/vm/dart_api_state.h
index 7946ef8ea5bfcc50162865e52d0b0efcb7e5ee69..1928ca00a5d827212f4f30e676d2ccbac771358e 100644
--- a/runtime/vm/dart_api_state.h
+++ b/runtime/vm/dart_api_state.h
@@ -723,15 +723,17 @@ class ApiNativeScope {
 // environment. When outside an isolate environment it picks the zone
 // from the current native scope.
 template <typename T>
-class ApiGrowableArray : public BaseGrowableArray<T, ValueObject> {
+class ApiGrowableArray : public BaseGrowableArray<T, ValueObject, Zone> {
  public:
   explicit ApiGrowableArray(int initial_capacity)
-      : BaseGrowableArray<T, ValueObject>(initial_capacity,
-                                          ApiNativeScope::Current()->zone()) {}
+      : BaseGrowableArray<T, ValueObject, Zone>(
+            initial_capacity,
+            ApiNativeScope::Current()->zone()) {}
   ApiGrowableArray()
-      : BaseGrowableArray<T, ValueObject>(ApiNativeScope::Current()->zone()) {}
+      : BaseGrowableArray<T, ValueObject, Zone>(
+            ApiNativeScope::Current()->zone()) {}
   ApiGrowableArray(intptr_t initial_capacity, Zone* zone)
-      : BaseGrowableArray<T, ValueObject>(initial_capacity, zone) {}
+      : BaseGrowableArray<T, ValueObject, Zone>(initial_capacity, zone) {}
 };