Add {Map,Set}::FromArray to the API

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 21133 matching lines @@
   v8::Local<v8::Array> entries = map->AsArray();
   CHECK_EQ(2, entries->Length());
   v8::Local<v8::Array> entry = entries->Get(0).As<v8::Array>();
   CHECK_EQ(2, entry->Length());
   CHECK_EQ(1, entry->Get(0).As<v8::Int32>()->Value());
   CHECK_EQ(2, entry->Get(1).As<v8::Int32>()->Value());
   entry = entries->Get(1).As<v8::Array>();
   CHECK_EQ(2, entry->Length());
   CHECK_EQ(3, entry->Get(0).As<v8::Int32>()->Value());
   CHECK_EQ(4, entry->Get(1).As<v8::Int32>()->Value());
+
+  map = v8::Map::FromArray(env.local(), entries).ToLocalChecked();
+  CHECK_EQ(2, map->Size());
 }
 
 
 TEST(Set) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope handle_scope(isolate);
   LocalContext env;
 
   v8::Local<v8::Set> set = v8::Set::New(isolate);
   CHECK(set->IsObject());
   CHECK(set->IsSet());
   CHECK_EQ(0, set->Size());
 
   v8::Local<v8::Value> val = CompileRun("new Set([1, 2])");
   CHECK(val->IsSet());
   set = v8::Local<v8::Set>::Cast(val);
   CHECK_EQ(2, set->Size());
 
   v8::Local<v8::Array> keys = set->AsArray();
   CHECK_EQ(2, keys->Length());
   CHECK_EQ(1, keys->Get(0).As<v8::Int32>()->Value());
   CHECK_EQ(2, keys->Get(1).As<v8::Int32>()->Value());
+
+  set = v8::Set::FromArray(env.local(), keys).ToLocalChecked();
+  CHECK_EQ(2, set->Size());
 }