DevTools: properly support targets in LiveEditSupport

Source/devtools/front_end/sdk/DefaultScriptMapping.js

Index: Source/devtools/front_end/sdk/DefaultScriptMapping.js
diff --git a/Source/devtools/front_end/sdk/DefaultScriptMapping.js b/Source/devtools/front_end/sdk/DefaultScriptMapping.js
index 2a3839091b8bc5a013ecab87217f75413c1e74f1..5829c4fefd7db5356acde1e26042be562068eae1 100644
--- a/Source/devtools/front_end/sdk/DefaultScriptMapping.js
+++ b/Source/devtools/front_end/sdk/DefaultScriptMapping.js
@@ -123,6 +123,15 @@ WebInspector.DefaultScriptMapping.prototype = {
 }
 
 /**
+ * @param {string} projectId
+ * @returns {number}
+ */
+WebInspector.DefaultScriptMapping.targetIdFromProjectId = function(projectId)
+{
+    return projectId.startsWith("debugger:") ? parseInt(projectId.substring(9), 10) : -1;
+}
+
+/**
  * @constructor
  * @param {!WebInspector.Workspace} workspace
  * @param {string} id