Fix library name display in devtools

BUG=

Review URL: https://codereview.chromium.org/1670023002 .

git-svn-id: https://src.chromium.org/blink/branches/dart/2454_1@202769 bbb929c8-8fbe-4397-9dbb-9b2b20218538
diff --git a/Source/devtools/front_end/components/ExecutionContextModel.js b/Source/devtools/front_end/components/ExecutionContextModel.js
index 95a5589..dedee3d 100644
--- a/Source/devtools/front_end/components/ExecutionContextModel.js
+++ b/Source/devtools/front_end/components/ExecutionContextModel.js
@@ -32,6 +32,12 @@
     _titleFor: function(executionContext)
     {
         var result;
+        // Start Dart specific code.
+        if (executionContext.language == "Dart") {
+            return executionContext.name;
+        }
+        // End Dart specific code.
+
         if (executionContext.isMainWorldContext) {
             if (executionContext.frameId) {
                 var frame = executionContext.target().resourceTreeModel.frameForId(executionContext.frameId);