Implement ClassMirror.owner and LibraryMirror.uri.

dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart

Index: dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart b/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
index 54ded9ccb8f91461f6e0e48d135941013ed13e2d..4dc3294464e1af05241adb17131b85b7640c6d67 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
@@ -3033,16 +3033,28 @@ if (typeof document !== "undefined" && document.readyState !== "complete") {
         for (LibraryElement library in sortedLibraries) {
           List<CodeBuffer> buffers = libraryBuffers[library];
           var buffer = buffers[0];
+          var uri = library.canonicalUri;
+          if (uri.scheme == 'file' && compiler.sourceMapUri != null) {
+            // TODO(ahe): It is a hack to use compiler.sourceMapUri
+            // here.  It should be relative to the main JavaScript
+            // output file.
+            uri = relativize(
+                compiler.sourceMapUri, library.canonicalUri, false);
+          }
           if (buffer != null) {
             mainBuffer
-                ..write('["${library.getLibraryOrScriptName()}",$_{$n')
+                ..write('["${library.getLibraryOrScriptName()}",$_')
+                ..write('"${uri}",$_')
+                ..write('{$n')
                 ..addBuffer(buffer)
                 ..write('}],$n');
           }
           buffer = buffers[1];
           if (buffer != null) {
             deferredBuffer
-                ..write('["${library.getLibraryOrScriptName()}",$_{$n')
+                ..write('["${library.getLibraryOrScriptName()}",$_')
+                ..write('"${uri}",$_')
+                ..write('{$n')
                 ..addBuffer(buffer)
                 ..write('}],$n');
           }
@@ -3227,7 +3239,8 @@ const String REFLECTION_DATA_PARSER = r'''
   for (var i = 0; i < length; i++) {
     var data = reflectionData[i];
     var name = data[0];
-    var descriptor = data[1];
+    var uri = data[1];
+    var descriptor = data[2];
     var classes = [];
     var functions = [];
     for (var property in descriptor) {
@@ -3242,7 +3255,6 @@ const String REFLECTION_DATA_PARSER = r'''
         classes.push(element[""]);
       }
     }
-    var uri = ".../library" + i + ".dart";
     libraries.push([name, uri, classes, functions]);
   }
 })''';