Create a character stream and hook it up to the parse info

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index d2634904a7aa81a6332ec4d81b764bb5d3d5a7eb..7ef25540177494342b93cce1ce978a7d510de104 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -85,6 +85,11 @@ class ParseInfo {
     source_stream_encoding_ = source_stream_encoding;
   }
 
+  Utf16CharacterStream* character_stream() const { return character_stream_; }
+  void set_character_stream(Utf16CharacterStream* character_stream) {
+    character_stream_ = character_stream;
+  }
+
   v8::Extension* extension() { return extension_; }
   void set_extension(v8::Extension* extension) { extension_ = extension; }
 
@@ -175,6 +180,7 @@ class ParseInfo {
   unsigned flags_;
   ScriptCompiler::ExternalSourceStream* source_stream_;
   ScriptCompiler::StreamedSource::Encoding source_stream_encoding_;
+  Utf16CharacterStream* character_stream_;
   v8::Extension* extension_;
   ScriptCompiler::CompileOptions compile_options_;
   Scope* script_scope_;