Implement bookmarks for ExternalStreamingStream.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 125a31be06f94b802e9f61a465335ee641b8c189..2e8c9589e9e670bc0a425297dbdede36413b261a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1525,6 +1525,12 @@ ScriptCompiler::CachedData::~CachedData() {
 }
 
 
+bool ScriptCompiler::ExternalSourceStream::SetBookmark() { return false; }
+
+
+void ScriptCompiler::ExternalSourceStream::ResetToBookmark() { UNREACHABLE(); }
+
+
 ScriptCompiler::StreamedSource::StreamedSource(ExternalSourceStream* stream,
                                                Encoding encoding)
     : impl_(new i::StreamedSource(stream, encoding)) {}