Add script streaming API

src/background-parser-thread.h

Index: src/background-parser-thread.h
diff --git a/src/background-parser-thread.h b/src/background-parser-thread.h
new file mode 100644
index 0000000000000000000000000000000000000000..a4b0bf768e6eada5e4b541e89bf4ed85e0b30a0f
--- /dev/null
+++ b/src/background-parser-thread.h
@@ -0,0 +1,64 @@
+// 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_BACKGROUND_PARSER_THREAD_H_
+#define V8_BACKGROUND_PARSER_THREAD_H_
+
+#include "src/base/platform/platform.h"
+#include "src/base/platform/semaphore.h"
+#include "src/compiler.h"
+
+namespace v8 {
+namespace internal {
+
+class BackgroundParsingTask {
+ public:
+  BackgroundParsingTask(ScriptCompiler::StreamedSource* source,
+                        ScriptCompiler::StreamingCompleteCallback callback,
+                        void* callback_data, bool allow_lazy, Isolate* isolate)
+      : source_(source),
+        callback_(callback),
+        callback_data_(callback_data),
+        script_data_(NULL),
+        hash_seed_(isolate->heap()->HashSeed()),
+        allow_lazy_(allow_lazy),
+        isolate_(isolate) {}
+
+  void Run();
+
+ private:
+  friend class v8::ScriptCompiler;
+
+  ScriptCompiler::StreamedSource* source_;
+  ScriptCompiler::StreamingCompleteCallback callback_;
+  void* callback_data_;
+  ScriptData* script_data_;
+  uint32_t hash_seed_;
+  bool allow_lazy_;
+  Isolate* isolate_;
+};
+
+
+// For compiling on the background.
+class BackgroundParserThread : public base::Thread {
+ public:
+  BackgroundParserThread();
+
+  virtual void Run();
+
+  void Stop();
+  // This can only be called after the previous task has finished.
+  void SetTask(BackgroundParsingTask* task);
+
+  bool HasTask() const { return task_ != NULL; }
+
+ private:
+  BackgroundParsingTask* task_;
+  base::Semaphore have_work_;
+  bool should_stop_;
+};
+}
+}  // namespace v8::internal
+
+#endif  // V8_BACKGROUND_PARSER_THREAD_H_