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diff --git a/deps/v8/src/parsing/background-parsing-task.h b/deps/v8/src/parsing/background-parsing-task.h
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+++ b/deps/v8/src/parsing/background-parsing-task.h
@@ -0,0 +1,74 @@
+// Copyright 2014 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_PARSING_BACKGROUND_PARSING_TASK_H_
+#define V8_PARSING_BACKGROUND_PARSING_TASK_H_
+
+#include <memory>
+
+#include "include/v8.h"
+#include "src/base/platform/platform.h"
+#include "src/base/platform/semaphore.h"
+#include "src/compiler.h"
+#include "src/parsing/parse-info.h"
+#include "src/unicode-cache.h"
+
+namespace v8 {
+namespace internal {
+
+class Parser;
+class ScriptData;
+class TimedHistogram;
+
+// Internal representation of v8::ScriptCompiler::StreamedSource. Contains all
+// data which needs to be transmitted between threads for background parsing,
+// finalizing it on the main thread, and compiling on the main thread.
+struct StreamedSource {
+  StreamedSource(ScriptCompiler::ExternalSourceStream* source_stream,
+                 ScriptCompiler::StreamedSource::Encoding encoding)
+      : source_stream(source_stream), encoding(encoding) {}
+
+  void Release();
+
+  // Internal implementation of v8::ScriptCompiler::StreamedSource.
+  std::unique_ptr<ScriptCompiler::ExternalSourceStream> source_stream;
+  ScriptCompiler::StreamedSource::Encoding encoding;
+  std::unique_ptr<ScriptCompiler::CachedData> cached_data;
+
+  // Data needed for parsing, and data needed to to be passed between thread
+  // between parsing and compilation. These need to be initialized before the
+  // compilation starts.
+  UnicodeCache unicode_cache;
+  std::unique_ptr<ParseInfo> info;
+  std::unique_ptr<Parser> parser;
+
+  // Data needed for finalizing compilation after background compilation.
+  std::unique_ptr<CompilationJob> outer_function_job;
+  CompilationJobList inner_function_jobs;
+
+  // Prevent copying.
+  StreamedSource(const StreamedSource&) = delete;
+  StreamedSource& operator=(const StreamedSource&) = delete;
+};
+
+class BackgroundParsingTask : public ScriptCompiler::ScriptStreamingTask {
+ public:
+  BackgroundParsingTask(StreamedSource* source,
+                        ScriptCompiler::CompileOptions options, int stack_size,
+                        Isolate* isolate);
+
+  virtual void Run();
+
+ private:
+  StreamedSource* source_;  // Not owned.
+  int stack_size_;
+  ScriptData* script_data_;
+  AccountingAllocator* allocator_;
+  TimedHistogram* timer_;
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_PARSING_BACKGROUND_PARSING_TASK_H_