DevTools: Add test multi-target-breakpoint-manager.html

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 52b892ca54e6b606ad4a24676606f5cbc61c947d..1e354875d6daa93acc3acfc15f83fe63366aa56d 100644
--- a/Source/devtools/front_end/sdk/Target.js
+++ b/Source/devtools/front_end/sdk/Target.js
@@ -257,17 +257,35 @@ WebInspector.TargetManager.prototype = {
          */
         function callbackWrapper(newTarget)
         {
-            this._targets.push(newTarget);
-            var copy = this._observers;
-            for (var i = 0; i < copy.length; ++i)
-                copy[i].targetAdded(newTarget);
-
+            this.addTarget(newTarget);
             if (callback)
                 callback(newTarget);
         }
     },
 
     /**
+     * @param {!WebInspector.Target} newTarget
+     */
+    addTarget: function(newTarget)
+    {
+        this._targets.push(newTarget);
+        var copy = this._observers;
+        for (var i = 0; i < copy.length; ++i)
+            copy[i].targetAdded(newTarget);
+    },
+
+    /**
+     * @param {!WebInspector.Target} target
+     */
+    removeTarget: function(target)
+    {
+        this._targets.remove(target);
+        var copy = this._observers;
+        for (var i = 0; i < copy.length; ++i)
+            copy[i].targetRemoved(target);
+    },
+
+    /**
      * @return {!Array.<!WebInspector.Target>}
      */
     targets: function()