Pass path to platform kernel binary to kernel-service.

runtime/vm/isolate_reload_test.cc

 // Copyright (c) 2016, 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 "include/dart_api.h"
 #include "include/dart_tools_api.h"
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/isolate.h"
 #include "vm/lockers.h"
@@ skipping 170 matching lines @@
       "file:///test-lib.dart",
       "WhatsTheMeaningOfAllThis() {\n"
       "  return 24;\n"
       "}\n"
       ""
     }};
   // clang-format on
   {
     void* kernel_pgm = NULL;
     char* error = TestCase::CompileTestScriptWithDFE(
-        "file:///test-app",
+        "file:///test-app.dart",
         sizeof(updated_sourcefiles) / sizeof(Dart_SourceFile),
         updated_sourcefiles, &kernel_pgm, true /* incrementally */);
     EXPECT(error == NULL);
     EXPECT_NOTNULL(kernel_pgm);
 
     lib = TestCase::ReloadTestKernel(kernel_pgm);
     EXPECT_VALID(lib);
   }
   result = Dart_Invoke(lib, NewString("main"), 0, NULL);
   result = Dart_IntegerToInt64(result, &value);
@@ skipping 54 matching lines @@
       "}\n"
       "main() {\n"
       "  return (new MyAccountState(new Account()))\n"
       "      .howAreTheThings().balance();\n"
       "}\n",
     }};
   // clang-format on
   {
     void* kernel_pgm = NULL;
     char* error = TestCase::CompileTestScriptWithDFE(
-        "file:///test-app",
+        "file:///test-app.dart",
         sizeof(updated_sourcefiles) / sizeof(Dart_SourceFile),
         updated_sourcefiles, &kernel_pgm, true /* incrementally */);
     EXPECT(error == NULL);
     EXPECT_NOTNULL(kernel_pgm);
 
     lib = TestCase::ReloadTestKernel(kernel_pgm);
     EXPECT_VALID(lib);
   }
   result = Dart_Invoke(lib, NewString("main"), 0, NULL);
   result = Dart_IntegerToInt64(result, &value);
@@ skipping 3332 matching lines @@
       "}\n";
 
   Dart_Handle result = TestCase::ReloadTestScript(kReloadScript);
   EXPECT_VALID(result);
   EXPECT_STREQ("false", SimpleInvokeStr(lib, "main"));
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart