Landing http://codereview.chromium.org/1594017 for Ryan.

src/api.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2715 matching lines @@
   if ( (length == -1) || (length > str->length() - start) )
     end = str->length() - start;
   if (end < 0) return 0;
   i::String::WriteToFlat(*str, buffer, start, end);
   if (length == -1 || end < length)
     buffer[end] = '\0';
   return end;
 }
 
 
+void v8::String::Flatten() {
+  if (IsDeadCheck("v8::String::Flatten()")) return;
+  i::Handle<i::String> str = Utils::OpenHandle(this);
+  i::FlattenString(str);
+}
+
+
 bool v8::String::IsExternal() const {
   EnsureInitialized("v8::String::IsExternal()");
   i::Handle<i::String> str = Utils::OpenHandle(this);
   return i::StringShape(*str).IsExternalTwoByte();
 }
 
 
 bool v8::String::IsExternalAscii() const {
   EnsureInitialized("v8::String::IsExternalAscii()");
   i::Handle<i::String> str = Utils::OpenHandle(this);
@@ skipping 1460 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal