DevTools: introduce ResourceMapping

third_party/WebKit/Source/devtools/front_end/bindings/ResourceScriptMapping.js

Index: third_party/WebKit/Source/devtools/front_end/bindings/ResourceScriptMapping.js
diff --git a/third_party/WebKit/Source/devtools/front_end/bindings/ResourceScriptMapping.js b/third_party/WebKit/Source/devtools/front_end/bindings/ResourceScriptMapping.js
index 1c9adacc6de6410df41370b2616c992b2b4e0712..059e9dba237c2262af1af485d1b6485763867fcb 100644
--- a/third_party/WebKit/Source/devtools/front_end/bindings/ResourceScriptMapping.js
+++ b/third_party/WebKit/Source/devtools/front_end/bindings/ResourceScriptMapping.js
@@ -191,7 +191,12 @@ Bindings.ResourceScriptMapping = class {
   _workspaceUISourceCodeForScript(script) {
     if (script.isAnonymousScript())
       return null;
-    return Bindings.NetworkProject.uiSourceCodeForScriptURL(this._workspace, script.sourceURL, script);
+    var uiSourceCode = Bindings.NetworkProject.uiSourceCodeForScriptURL(this._workspace, script.sourceURL, script);
+    if (!uiSourceCode) {
+      var resourceBinding = Bindings.ResourceBinding.forTarget(this._debuggerModel.target());
+      uiSourceCode = resourceBinding ? resourceBinding.uiSourceCodeForURL(script.sourceURL) : null;
+    }
+    return uiSourceCode;
   }
 
   /**