Add new Dart API function Dart_IsolateData which returns the peer isolate data associated with an i…

runtime/vm/dart_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/builtin.h"
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
@@ skipping 3041 matching lines @@
 
 UNIT_TEST_CASE(CurrentIsolateData) {
   intptr_t mydata = 12345;
   char* err;
   Dart_Isolate isolate =
       Dart_CreateIsolate(NULL, NULL, bin::snapshot_buffer,
                          reinterpret_cast<void*>(mydata),
                          &err);
   EXPECT(isolate != NULL);
   EXPECT_EQ(mydata, reinterpret_cast<intptr_t>(Dart_CurrentIsolateData()));
+  EXPECT_EQ(mydata, reinterpret_cast<intptr_t>(Dart_IsolateData(isolate)));
   Dart_ShutdownIsolate();
 }
 
 
 TEST_CASE(DebugName) {
   Dart_Handle debug_name = Dart_DebugName();
   EXPECT_VALID(debug_name);
   EXPECT(Dart_IsString(debug_name));
 }
 
@@ skipping 4757 matching lines @@
                                    NewString("main"),
                                    1,
                                    dart_args);
   int64_t value = 0;
   result = Dart_IntegerToInt64(result, &value);
   EXPECT_VALID(result);
   EXPECT_EQ(6, value);
 }
 
 }  // namespace dart