Intern AST and Model names to reduce char[]/String waste.

compiler/java/com/google/dart/compiler/util/StringInterner.java

Index: compiler/java/com/google/dart/compiler/util/StringInterner.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/html/parser/TestAll.java b/compiler/java/com/google/dart/compiler/util/StringInterner.java
similarity index 61%
copy from editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/html/parser/TestAll.java
copy to compiler/java/com/google/dart/compiler/util/StringInterner.java
index 59291181a3b19caabb2e19e756b35f7a303ff950..e33118e9266818403dc362a5eca75928d273beab 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/html/parser/TestAll.java
+++ b/compiler/java/com/google/dart/compiler/util/StringInterner.java
@@ -11,17 +11,21 @@
  * or implied. See the License for the specific language governing permissions and limitations under
  * the License.
  */
-package com.google.dart.engine.html.parser;
 
-import com.google.dart.engine.ExtendedTestSuite;
+package com.google.dart.compiler.util;
 
-import junit.framework.Test;
-import junit.framework.TestSuite;
+import com.google.common.collect.Interner;
+import com.google.common.collect.Interners;
 
-public class TestAll {
-  public static Test suite() {
-    TestSuite suite = new ExtendedTestSuite("Tests in " + TestAll.class.getPackage().getName());
-    suite.addTestSuite(HtmlParserTest.class);
-    return suite;
+public class StringInterner {
+  private static Interner<String> INTERNER = Interners.newStrongInterner();
+  
+  public static String intern(String s) {
+    if (s == null) {
+      return null;
+    }
+    s = new String(s);
+    return INTERNER.intern(s);
+//    return s;
   }
 }