DevTools: make paint profiler target-aware

Source/devtools/front_end/sdk/Target.js

Index: Source/devtools/front_end/sdk/Target.js
diff --git a/Source/devtools/front_end/sdk/Target.js b/Source/devtools/front_end/sdk/Target.js
index dc5ffba3f2747094417a59087b0c09755a1e0736..ccdf45d0c0f6260c2599b053b944413268068742 100644
--- a/Source/devtools/front_end/sdk/Target.js
+++ b/Source/devtools/front_end/sdk/Target.js
@@ -14,6 +14,8 @@
 WebInspector.Target = function(name, connection, callback)
 {
     Protocol.Agents.call(this, connection.agentsMap());
+    /** @type {!WeakReference.<!WebInspector.Target>} */
+    this._weakReference = new WeakReference(this);
     this._name = name;
     this._connection = connection;
     /** @type {boolean} */
@@ -58,6 +60,14 @@ WebInspector.Target.prototype = {
     },
 
     /**
+     * @return {!WeakReference.<!WebInspector.Target>}
+     */
+    weakReference: function()
+    {
+       return this._weakReference;
+    },
+
+    /**
      * @param {string} name
      * @param {function()|null} callback
      * @param {?Protocol.Error} error
@@ -182,6 +192,7 @@ WebInspector.Target.prototype = {
 
     dispose: function()
     {
+        this._weakReference.clear();
         this.debuggerModel.dispose();
         this.networkManager.dispose();
         this.cpuProfilerModel.dispose();