Add script streaming API

src/background-parsing-task.cc

Index: src/background-parsing-task.cc
diff --git a/src/background-parsing-task.cc b/src/background-parsing-task.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7065f952dbd3b76b8e2313d584676ea8f6eca2e4
--- /dev/null
+++ b/src/background-parsing-task.cc
@@ -0,0 +1,31 @@
+// 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.
+
+#include "src/background-parsing-task.h"
+
+#include "src/parser.h"
+
+namespace v8 {
+namespace internal {
+
+static const int kBackgroundParserThreadStackSize = 64 * KB;
+
+void BackgroundParsingTask::Run() {
+  uintptr_t limit =
+      reinterpret_cast<uintptr_t>(&limit) - kBackgroundParserThreadStackSize;
+  Parser parser(source_->info, limit, hash_seed_);
+  parser.set_allow_lazy(allow_lazy_);
+  parser.ParseOnBackground();
+
+  if (script_data_ != NULL) {
+    source_->cached_data = new ScriptCompiler::CachedData(
+        script_data_->data(), script_data_->length(),
+        ScriptCompiler::CachedData::BufferOwned);
+    script_data_->ReleaseDataOwnership();
+    delete script_data_;
+    script_data_ = NULL;
+  }
+}
+}
+}  // namespace v8::internal