Add a prepare to parse step to CompilerDispatcherJob

src/compiler-dispatcher/compiler-dispatcher-job.h

 // 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.
 
 #ifndef V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_JOB_H_
 #define V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_JOB_H_
 
+#include <memory>
+
 #include "src/base/macros.h"
-
 #include "src/handles.h"
 
 namespace v8 {
 namespace internal {
 
 class CompilationInfo;
 class Isolate;
 class JSFunction;
+class ParseInfo;
+class UnicodeCache;
+class Zone;
 
 enum class CompileJobStatus {
   kInitial,
+  kReadyToParse,
 };
 
 class CompilerDispatcherJob {
  public:
   CompilerDispatcherJob(Isolate* isolate, Handle<JSFunction> function);
   ~CompilerDispatcherJob();
 
   CompileJobStatus status() const { return status_; }
 
+  // Transition from kInitial to kReadyToParse.
+  void PrepareToParseOnMainThread();
+
  private:
   CompileJobStatus status_ = CompileJobStatus::kInitial;
   Isolate* isolate_;
   Handle<JSFunction> function_;  // Global handle.
 
+  // Members required for parsing.
+  std::unique_ptr<UnicodeCache> unicode_cache_;
+  std::unique_ptr<Zone> zone_;
+  std::unique_ptr<ParseInfo> parse_info_;
+
   DISALLOW_COPY_AND_ASSIGN(CompilerDispatcherJob);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_JOB_H_