[Compiler] Ensure we enter the correct context for compiler-dispatcher jobs.

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 "include/v8.h"
@@ skipping 42 matching lines @@
                         Handle<SharedFunctionInfo> shared,
                         FunctionLiteral* literal,
                         std::shared_ptr<Zone> parse_zone,
                         std::shared_ptr<DeferredHandles> parse_handles,
                         std::shared_ptr<DeferredHandles> compile_handles,
                         size_t max_stack_size);
   ~CompilerDispatcherJob();
 
   CompileJobStatus status() const { return status_; }
 
+  Context* context() { return *context_; }
+
   // Returns true if this CompilerDispatcherJob was created for the given
   // function.
   bool IsAssociatedWith(Handle<SharedFunctionInfo> shared) const;
 
   // Transition from kInitial to kReadyToParse.
   void PrepareToParseOnMainThread();
 
   // Transition from kReadyToParse to kParsed.
   void Parse();
 
@@ skipping 25 matching lines @@
   // Even though the name does not imply this, ShortPrint() must only be invoked
   // on the main thread.
   void ShortPrint();
 
  private:
   FRIEND_TEST(CompilerDispatcherJobTest, ScopeChain);
 
   CompileJobStatus status_;
   Isolate* isolate_;
   CompilerDispatcherTracer* tracer_;
+  Handle<Context> context_;            // Global handle.
   Handle<SharedFunctionInfo> shared_;  // Global handle.
   Handle<String> source_;        // Global handle.
   Handle<String> wrapper_;       // Global handle.
   std::unique_ptr<v8::String::ExternalStringResourceBase> source_wrapper_;
   size_t max_stack_size_;
 
   // Members required for parsing.
   std::unique_ptr<UnicodeCache> unicode_cache_;
   std::unique_ptr<Utf16CharacterStream> character_stream_;
   std::unique_ptr<ParseInfo> parse_info_;
   std::unique_ptr<Parser> parser_;
 
   // Members required for compiling a parsed function.
   std::shared_ptr<Zone> parse_zone_;
 
   // Members required for compiling.
   std::unique_ptr<CompilationInfo> compile_info_;
   std::unique_ptr<CompilationJob> compile_job_;
 
   bool trace_compiler_dispatcher_jobs_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilerDispatcherJob);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_DISPATCHER_COMPILER_DISPATCHER_JOB_H_