Enabled class name minification in production mode. Reduces removes 52K (optimzed) from swarm.

Review URL: http://codereview.chromium.org//8252006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@401 260f80e4-7a28-3924-810f-c04153c831b5

compiler/java/com/google/dart/compiler/DefaultCompilerConfiguration.java

@@ -51,7 +51,9 @@ public class DefaultCompilerConfiguration implements CompilerConfiguration {
       return new DartIsolateStubGenerator(compilerOptions.getIsolateStubClasses(),
                                           compilerOptions.getIsolateStubOutputFile());
     } else if (compilerOptions.shouldOptimize()) {
-      return new ClosureJsBackend(compilerOptions.generateHumanReadableOutput());
+      return new ClosureJsBackend(
+          compilerOptions.developerModeChecks(),
+          compilerOptions.generateHumanReadableOutput());
     } else {
       return new JavascriptBackend();
     }

compiler/java/com/google/dart/compiler/backend/js/ClosureJsBackend.java

@@ -82,28 +82,33 @@ public class ClosureJsBackend extends AbstractJsBackend {
   // Validate the generated JavaScript
   private final boolean validate;
 
+  // Whether the generated code is "checked".
+  private final boolean checkedMode;
+
   public ClosureJsBackend() {
-    this(false);
+    this(false, false);
   }
 
   /**
    * @param generateHumanReadableOutput - generates human readable javascript output.
    */
-  public ClosureJsBackend(boolean generateHumanReadableOutput) {
+  public ClosureJsBackend(boolean checkedMode, boolean generateHumanReadableOutput) {
     // Current default settings
-    this(false, true, false, true, generateHumanReadableOutput);
+    this(false, true, false, true, checkedMode, generateHumanReadableOutput);
   }
 
   public ClosureJsBackend(boolean fastOutput,
                           boolean produceSourceMap,
                           boolean incremental,
                           boolean validate,
+                          boolean checkedMode,
                           boolean generateHumanReadableOutput) {
     this.fastOutput = fastOutput;
     this.produceSourceMap = produceSourceMap;
     // can't currently produce a valid source map incrementally
     this.incremental = incremental && !produceSourceMap;
     this.validate = validate;
+    this.checkedMode = checkedMode;
     this.generateHumanReadableOutput = generateHumanReadableOutput;
   }
 
@@ -487,9 +492,11 @@ public class ClosureJsBackend extends AbstractJsBackend {
 
     /*
      * NOTE: We turn this off because TypeErrors or anything that relies on a type name will fail
-     * due to the renaming.
+     * due to the class renaming.
      */
-    options.setReplaceIdGenerators(false);
+    if (checkedMode) {
+      options.setReplaceIdGenerators(false);
+    }
 
     return options;
   }
@@ -576,7 +583,7 @@ public class ClosureJsBackend extends AbstractJsBackend {
    * @return a mutable list
    * @throws IOException
    */
-  public static List<JSSourceFile> getDefaultExterns() throws IOException {
+  private static List<JSSourceFile> getDefaultExterns() throws IOException {
     Class<ClosureJsBackend> clazz = ClosureJsBackend.class;
     InputStream input = clazz.getResourceAsStream(
         "/com/google/javascript/jscomp/externs.zip");

compiler/java/com/google/dart/runner/DartRunner.java

@@ -337,7 +337,9 @@ public class DartRunner {
       final DartRunnerOptions options, DartCompilerListener listener) throws RunnerError {
     Backend backend;
     if (options.shouldOptimize()) {
-      backend = new ClosureJsBackend(options.generateHumanReadableOutput());
+      backend = new ClosureJsBackend(
+          options.developerModeChecks(),
+          options.generateHumanReadableOutput());
     } else {
       backend = new JavascriptBackend();
     }