Fix issue http://dartbug.com/2342 by checking document.readyState

lib/compiler/implementation/emitter.dart

 // 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.
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
 class ClosureInvocationElement extends FunctionElement {
   ClosureInvocationElement(SourceString name,
@@ skipping 691 matching lines @@
     Element main = compiler.mainApp.find(Compiler.MAIN);
     String mainCall = null;
     if (compiler.isolateLibrary != null) {
       Element isolateMain =
         compiler.isolateLibrary.find(Compiler.START_ROOT_ISOLATE);
       mainCall = buildIsolateSetup(buffer, main, isolateMain);
     } else {
       mainCall = '${namer.isolateAccess(main)}()';
     }
     buffer.add("""
-if (typeof window != 'undefined' && window.addEventListener) {
+if (typeof window != 'undefined' && typeof document != 'undefined' &&
+    window.addEventListener && document.readyState == 'loading') {
   window.addEventListener('DOMContentLoaded', function(e) {
     ${mainCall};
   });
 } else {
   ${mainCall};
 }
 """);
   }
 
   String assembleProgram() {
     measure(() {
       mainBuffer.add('function ${namer.ISOLATE}() {');
       emitStaticNonFinalFieldInitializations(mainBuffer);
       mainBuffer.add('}\n\n');
       emitClasses(mainBuffer);
       emitStaticFunctions(mainBuffer);
       emitStaticFunctionGetters(mainBuffer);
       emitCompileTimeConstants(mainBuffer);
       emitStaticFinalFieldInitializations(mainBuffer);
       nativeEmitter.emitDynamicDispatchMetadata();
       mainBuffer.add(
           'var ${namer.CURRENT_ISOLATE} = new ${namer.ISOLATE}();\n');
       nativeEmitter.assembleCode(mainBuffer);
       emitMain(mainBuffer);
       compiler.assembledCode = mainBuffer.toString();
     });
     return compiler.assembledCode;
   }
 }