Landing https://codereview.chromium.org/40133004 for mnita@google.com.

src/runtime.cc

 // Copyright 2012 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 14015 matching lines @@
                                               string_value1.length(),
                                               u_string2,
                                               string_value2.length(),
                                               status);
   if (U_FAILURE(status)) return isolate->ThrowIllegalOperation();
 
   return *isolate->factory()->NewNumberFromInt(result);
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_StringNormalize) {
+  HandleScope scope(isolate);
+  static const UNormalizationMode normalizationForms[] =
+      { UNORM_NFC, UNORM_NFD, UNORM_NFKC, UNORM_NFKD };
+
+  ASSERT(args.length() == 2);
+
+  CONVERT_ARG_HANDLE_CHECKED(String, stringValue, 0);
+  CONVERT_NUMBER_CHECKED(int, form_id, Int32, args[1]);
+
+  v8::String::Value string_value(v8::Utils::ToLocal(stringValue));
+  const UChar* u_value = reinterpret_cast<const UChar*>(*string_value);
+
+  // TODO(mnita): check Normalizer2 (not available in ICU 46)
+  UErrorCode status = U_ZERO_ERROR;
+  icu::UnicodeString result;
+  icu::Normalizer::normalize(u_value, normalizationForms[form_id], 0,
+      result, status);
+  if (U_FAILURE(status)) {
+    return isolate->heap()->undefined_value();
+  }
+
+  return *isolate->factory()->NewStringFromTwoByte(
+      Vector<const uint16_t>(
+          reinterpret_cast<const uint16_t*>(result.getBuffer()),
+          result.length()));
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateBreakIterator) {
   HandleScope scope(isolate);
 
   ASSERT(args.length() == 3);
 
   CONVERT_ARG_HANDLE_CHECKED(String, locale, 0);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, options, 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, resolved, 2);
 
   Handle<ObjectTemplateInfo> break_iterator_template =
@@ skipping 790 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal