Add script streaming API

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index e3cee84097346b881e8b1e9f744af1cb4a150a02..909e4f3c019919526934a816413c43e2d1d1064f 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -604,7 +604,7 @@ class ParserTraits {
 
 class Parser : public ParserBase<ParserTraits> {
  public:
-  explicit Parser(CompilationInfo* info);
+  Parser(CompilationInfo* info, uintptr_t stack_limit, uint32_t hash_seed);
   ~Parser() {
     delete reusable_preparser_;
     reusable_preparser_ = NULL;
@@ -617,11 +617,13 @@ class Parser : public ParserBase<ParserTraits> {
   // nodes) if parsing failed.
   static bool Parse(CompilationInfo* info,
                     bool allow_lazy = false) {
-    Parser parser(info);
+    Parser parser(info, info->isolate()->stack_guard()->real_climit(),
+                  info->isolate()->heap()->HashSeed());
     parser.set_allow_lazy(allow_lazy);
     return parser.Parse();
   }
   bool Parse();
+  void ParseOnBackground();
 
  private:
   friend class ParserTraits;
@@ -660,6 +662,8 @@ class Parser : public ParserBase<ParserTraits> {
   // Called by ParseProgram after setting up the scanner.
   FunctionLiteral* DoParseProgram(CompilationInfo* info,
                                   Handle<String> source);
+  FunctionLiteral* DoParseProgramInner(CompilationInfo* info, Scope** scope,
+                                       Scope** ad_hoc_eval_scope);
 
   void SetCachedData();
 
@@ -677,7 +681,8 @@ class Parser : public ParserBase<ParserTraits> {
   // By making the 'exception handling' explicit, we are forced to check
   // for failure at the call sites.
   void* ParseSourceElements(ZoneList<Statement*>* processor, int end_token,
-                            bool is_eval, bool is_global, bool* ok);
+                            bool is_eval, bool is_global,
+                            Scope** ad_hoc_eval_scope, bool* ok);
   Statement* ParseModuleElement(ZoneList<const AstRawString*>* labels,
                                 bool* ok);
   Statement* ParseModuleDeclaration(ZoneList<const AstRawString*>* names,
@@ -827,6 +832,8 @@ class Parser : public ParserBase<ParserTraits> {
   bool pending_error_is_reference_error_;
 
   int use_counts_[v8::Isolate::kUseCounterFeatureCount];
+
+  uint32_t hash_seed_;
 };