Allow surrogates in string literals.

runtime/vm/scanner.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/scanner.h"
 
 #include "platform/assert.h"
 #include "vm/dart.h"
 #include "vm/flags.h"
 #include "vm/object.h"
@@ skipping 466 matching lines @@
   } else {
     ReadChar();  // Skip left curly bracket.
     is_valid = ScanHexDigits(1, 6, code_point);
     if (is_valid) {
       if (c0_ != '}') {
         ErrorMsg("expected '}' after character code");
         return;
       }
     }
   }
-  if (is_valid &&
-      ((Utf::IsOutOfRange(*code_point) ||
-        (Utf16::IsSurrogate(*code_point))))) {
+  if (is_valid && (Utf::IsOutOfRange(*code_point))) {
     ErrorMsg("invalid code point");
   }
 }
 
 
 void Scanner::ScanLiteralStringChars(bool is_raw, bool remove_whitespace) {
   GrowableArray<int32_t> string_chars(64);
 
   ASSERT(IsScanningString());
   // We are at the first character of a string literal piece. A string literal
@@ skipping 454 matching lines @@
     keywords_[i].keyword_symbol = &Symbols::Token(token);
 
     int ch = keywords_[i].keyword_chars[0] - 'a';
     if (keywords_char_offset_[ch] == Token::kNumKeywords) {
       keywords_char_offset_[ch] = i;
     }
   }
 }
 
 }  // namespace dart