Add Symbol class.

dart/tests/corelib/corelib.status

Index: dart/tests/corelib/corelib.status
diff --git a/dart/tests/corelib/corelib.status b/dart/tests/corelib/corelib.status
index 9bc31d7381e560f379d6be4df5f2279ad2a5ba5a..8add05c47087d74c1bad57f75fefaf995cd1b717 100644
--- a/dart/tests/corelib/corelib.status
+++ b/dart/tests/corelib/corelib.status
@@ -9,6 +9,11 @@ unicode_test: Fail        # Bug 6706
 *dartc_test: Skip
 compare_to2_test: Fail    # Bug 4018
 
+symbol_test/01: Fail
+symbol_test/02: Fail
+symbol_test/03: Fail
+
+
 [ $runtime == ff || $runtime == ie9 || $runtime == jsshell ]
 unicode_test: Fail
 
@@ -49,6 +54,12 @@ string_base_vm_test: Fail, OK # VM specific test.
 
 string_replace_func_test: Skip # Bug 6554 - doesn't terminate.
 
+symbol_test/none: Fail
+symbol_test/01: Fail
+symbol_test/02: Fail
+symbol_test/03: Fail
+
+
 [ $compiler == dart2js && $runtime == none ]
 *: Fail, Pass # TODO(ahe): Triage these tests.
 
@@ -61,6 +72,11 @@ string_base_vm_test: Fail # BUG(3304): Maybe this doesn't time out?
 compare_to2_test: Fail # inherited from VM
 unicode_test: Fail # inherited from VM
 
+symbol_test/01: Fail
+symbol_test/02: Fail
+symbol_test/03: Fail
+
+
 # Library changes
 [ $compiler == none || $compiler == dart2js || $compiler == dart2dart ]
 map_keys2_test: Fail # Generic types aren't right.