Add a prepare to parse step to CompilerDispatcherJob

test/unittests/compiler-dispatcher/compiler-dispatcher-job-unittest.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 
 #include "src/compiler-dispatcher/compiler-dispatcher-job.h"
 #include "src/isolate-inl.h"
 #include "test/unittests/test-utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace v8 {
 namespace internal {
 
 typedef TestWithContext CompilerDispatcherJobTest;
 
 TEST_F(CompilerDispatcherJobTest, Construct) {
   Isolate* i_isolate = reinterpret_cast<Isolate*>(isolate());
   std::unique_ptr<CompilerDispatcherJob> job(
       new CompilerDispatcherJob(i_isolate, i_isolate->object_function()));
 }
 
+TEST_F(CompilerDispatcherJobTest, PrepareToParse) {
+  Isolate* i_isolate = reinterpret_cast<Isolate*>(isolate());
+  std::unique_ptr<CompilerDispatcherJob> job(
+      new CompilerDispatcherJob(i_isolate, i_isolate->object_function()));
+
+  ASSERT_TRUE(job->status() == CompileJobStatus::kInitial);
+  job->PrepareToParseOnMainThread();
+  ASSERT_TRUE(job->status() == CompileJobStatus::kReadyToParse);
+}
+
 }  // namespace internal
 }  // namespace v8