DevTools: do not show compiled script while source maps are being loaded.

Source/devtools/front_end/common/StaticContentProvider.js

Index: Source/devtools/front_end/common/StaticContentProvider.js
diff --git a/Source/devtools/front_end/common/StaticContentProvider.js b/Source/devtools/front_end/common/StaticContentProvider.js
index 0b8c8bda60ac4395e3c390328e40cd718acfa45c..268092661848791527784dbc309d141725336026 100644
--- a/Source/devtools/front_end/common/StaticContentProvider.js
+++ b/Source/devtools/front_end/common/StaticContentProvider.js
@@ -7,11 +7,13 @@
  * @implements {WebInspector.ContentProvider}
  * @param {!WebInspector.ResourceType} contentType
  * @param {string} content
+ * @param {string=} contentURL
  */
-WebInspector.StaticContentProvider = function(contentType, content)
+WebInspector.StaticContentProvider = function(contentType, content, contentURL)
 {
     this._content = content;
     this._contentType = contentType;
+    this._contentURL = contentURL || "";
 }
 
 /**
@@ -38,7 +40,7 @@ WebInspector.StaticContentProvider.prototype = {
      */
     contentURL: function()
     {
-        return "";
+        return this._contentURL;
     },
 
     /**